keep a map of agent mux connection info and added /mux/connections REST ...

...method

DEMO - serviced.log GET for https://plu-9/mux/connections:
```
I1110 03:25:37.680353 18774 cpserver.go:219] start getMasterClient ... sc.agentPort: 10.87.110.39:4979
I1110 03:25:37.680624 18774 cpserver.go:225] end getMasterClient
I1110 03:25:37.742796 18774 muxresource.go:73] mux connections (count:18) for host: 570a276e 172.17.42.1
I1110 03:25:37.742863 18774 muxresource.go:87]   127.0.0.1:5042        10.87.110.39    <-- 172.17.42.1     172.17.2.114:38587     (controlplane_logstash_tcp/0 <-- HMaster/%!d(string=0)) (controlplane_logstash_tcp <-- 449nwijlzmg81vw6lex42uohj) 1m21.774092919s
I1110 03:25:37.742897 18774 muxresource.go:87]   127.0.0.1:5042        10.87.110.39    <-- 172.17.42.1     172.17.2.116:54597     (controlplane_logstash_tcp/0 <-- RegionServer/%!d(string=0)) (controlplane_logstash_tcp <-- 83eg2eskvnz4qolgx5nxjl52o) 1m21.255228764s
I1110 03:25:37.742928 18774 muxresource.go:87]   127.0.0.1:5042        10.87.110.39    <-- 172.17.42.1     172.17.2.118:34134     (controlplane_logstash_tcp/0 <-- ZooKeeper/%!d(string=0)) (controlplane_logstash_tcp <-- dupxi7eorduknqzmcoo7c5imn) 1m17.836785324s
I1110 03:25:37.742952 18774 muxresource.go:87]   127.0.0.1:5043        10.87.110.39    <-- 172.17.42.1     172.17.2.114:38590     (controlplane_logstash_lumberjack/0 <-- HMaster/%!d(string=0)) (controlplane_logstash_lumberjack <-- 449nwijlzmg81vw6lex42uohj) 1m21.447839846s
I1110 03:25:37.742986 18774 muxresource.go:87]   127.0.0.1:5043        10.87.110.39    <-- 172.17.42.1     172.17.2.116:54588     (controlplane_logstash_lumberjack/0 <-- RegionServer/%!d(string=0)) (controlplane_logstash_lumberjack <-- 83eg2eskvnz4qolgx5nxjl52o) 1m22.00055225s
I1110 03:25:37.743033 18774 muxresource.go:87]   127.0.0.1:5043        10.87.110.39    <-- 172.17.42.1     172.17.2.118:34129     (controlplane_logstash_lumberjack/0 <-- ZooKeeper/%!d(string=0)) (controlplane_logstash_lumberjack <-- dupxi7eorduknqzmcoo7c5imn) 1m18.633463942s
I1110 03:25:37.743062 18774 muxresource.go:87]   127.0.0.1:8443        10.87.110.39    <-- 172.17.42.1     172.17.2.114:38646     (controlplane_consumer/0 <-- HMaster/%!d(string=0)) (controlplane_consumer <-- 449nwijlzmg81vw6lex42uohj) 1m14.738441257s
I1110 03:25:37.743089 18774 muxresource.go:87]   127.0.0.1:8443        10.87.110.39    <-- 172.17.42.1     172.17.2.116:54680     (controlplane_consumer/0 <-- RegionServer/%!d(string=0)) (controlplane_consumer <-- 83eg2eskvnz4qolgx5nxjl52o) 1m9.208273555s
I1110 03:25:37.743121 18774 muxresource.go:87]   127.0.0.1:8443        10.87.110.39    <-- 172.17.42.1     172.17.2.118:34192     (controlplane_consumer/0 <-- ZooKeeper/%!d(string=0)) (controlplane_consumer <-- dupxi7eorduknqzmcoo7c5imn) 1m3.806251522s
I1110 03:25:37.743144 18774 muxresource.go:87]   172.17.2.114:60000    10.87.110.39    <-- 172.17.42.1     172.17.2.116:57353     (hbase-master-1/0 <-- RegionServer/%!d(string=0)) (449nwijlzmg81vw6lex42uohj <-- 83eg2eskvnz4qolgx5nxjl52o) 58.58556604s
I1110 03:25:37.743171 18774 muxresource.go:87]   172.17.2.118:2181     10.87.110.39    <-- 172.17.42.1     172.17.2.114:33984     (zookeeper-client/0 <-- HMaster/%!d(string=0)) (dupxi7eorduknqzmcoo7c5imn <-- 449nwijlzmg81vw6lex42uohj) 1m14.928743574s
I1110 03:25:37.743197 18774 muxresource.go:87]   172.17.2.118:2181     10.87.110.39    <-- 172.17.42.1     172.17.2.114:34003     (zookeeper-client/0 <-- HMaster/%!d(string=0)) (dupxi7eorduknqzmcoo7c5imn <-- 449nwijlzmg81vw6lex42uohj) 1m13.73536458s
I1110 03:25:37.743222 18774 muxresource.go:87]   172.17.2.118:2181     10.87.110.39    <-- 172.17.42.1     172.17.2.114:34006     (zookeeper-client/0 <-- HMaster/%!d(string=0)) (dupxi7eorduknqzmcoo7c5imn <-- 449nwijlzmg81vw6lex42uohj) 1m13.522258012s
I1110 03:25:37.743244 18774 muxresource.go:87]   172.17.2.118:2181     10.87.110.39    <-- 172.17.42.1     172.17.2.114:34009     (zookeeper-client/0 <-- HMaster/%!d(string=0)) (dupxi7eorduknqzmcoo7c5imn <-- 449nwijlzmg81vw6lex42uohj) 1m12.66622299s
I1110 03:25:37.743265 18774 muxresource.go:87]   172.17.2.118:2181     10.87.110.39    <-- 172.17.42.1     172.17.2.116:57345     (zookeeper-client/0 <-- RegionServer/%!d(string=0)) (dupxi7eorduknqzmcoo7c5imn <-- 83eg2eskvnz4qolgx5nxjl52o) 59.061937536s
I1110 03:25:37.743290 18774 muxresource.go:87]   172.17.2.118:2181     10.87.110.39    <-- 172.17.42.1     172.17.2.116:57348     (zookeeper-client/0 <-- RegionServer/%!d(string=0)) (dupxi7eorduknqzmcoo7c5imn <-- 83eg2eskvnz4qolgx5nxjl52o) 58.940530144s
I1110 03:25:37.743313 18774 muxresource.go:87]   172.17.2.118:2181     10.87.110.39    <-- 172.17.42.1     172.17.2.116:57356     (zookeeper-client/0 <-- RegionServer/%!d(string=0)) (dupxi7eorduknqzmcoo7c5imn <-- 83eg2eskvnz4qolgx5nxjl52o) 58.340021093s
I1110 03:25:37.743339 18774 muxresource.go:87]   172.17.2.118:2181     10.87.110.39    <-- 172.17.42.1     172.17.2.116:57359     (zookeeper-client/0 <-- RegionServer/%!d(string=0)) (dupxi7eorduknqzmcoo7c5imn <-- 83eg2eskvnz4qolgx5nxjl52o) 58.256981947s
2014/11/10 03:25:37 200 64.134945ms GET /mux/connections
```

DEMO - https://plu-9/mux/connections:
```
{
  "570a276e": {
    "127.0.0.1:5042        10.87.110.39    \u003c-- 172.17.42.1     172.17.2.114:38587   ": {
      "AgentHostIP": "10.87.110.39",
      "AgentHostID": "570a276e",
      "Src": {
        "AgentHostIP": "172.17.42.1",
        "AgentHostID": "570a276e",
        "ServiceName": "HMaster",
        "TenantID": "91arc9qqzbyb07r45wo9l3om5",
        "ServiceID": "449nwijlzmg81vw6lex42uohj",
        "InstanceID": "0",
        "ContainerIP": "172.17.2.114",
        "ContainerID": "09d57f971436"
      },
      "SrcRemoteAddr": "172.17.2.114:38587",
      "SrcLocalAddr": "10.87.110.39:22250",
      "DstLocalAddr": "127.0.0.1:52762",
      "DstRemoteAddr": "127.0.0.1:5042",
      "DstName": "91arc9qqzbyb07r45wo9l3om5_controlplane_logstash_tcp",
      "ApplicationEndpoint": {
        "ServiceID": "controlplane_logstash_tcp",
        "Application": "controlplane_logstash_tcp",
        "ContainerPort": 5042,
        "HostPort": 5042,
        "HostIP": "10.87.110.39",
        "ContainerIP": "127.0.0.1",
        "Protocol": "tcp",
        "VirtualAddress": "",
        "InstanceID": 0,
        "ProxyPort": 5042
      },
      "ActiveWriters": 2,
      "CreatedAt": "2014-11-10T03:24:15.968769196Z"
    },
    "127.0.0.1:5042        10.87.110.39    \u003c-- 172.17.42.1     172.17.2.116:54597   ": {
      "AgentHostIP": "10.87.110.39",
      "AgentHostID": "570a276e",
      "Src": {
        "AgentHostIP": "172.17.42.1",
        "AgentHostID": "570a276e",
        "ServiceName": "RegionServer",
        "TenantID": "91arc9qqzbyb07r45wo9l3om5",
        "ServiceID": "83eg2eskvnz4qolgx5nxjl52o",
        "InstanceID": "0",
        "ContainerIP": "172.17.2.116",
        "ContainerID": "d517ce7a8192"
      },
      "SrcRemoteAddr": "172.17.2.116:54597",
      "SrcLocalAddr": "10.87.110.39:22250",
      "DstLocalAddr": "127.0.0.1:52768",
      "DstRemoteAddr": "127.0.0.1:5042",
      "DstName": "91arc9qqzbyb07r45wo9l3om5_controlplane_logstash_tcp",
      "ApplicationEndpoint": {
        "ServiceID": "controlplane_logstash_tcp",
        "Application": "controlplane_logstash_tcp",
        "ContainerPort": 5042,
        "HostPort": 5042,
        "HostIP": "10.87.110.39",
        "ContainerIP": "127.0.0.1",
        "Protocol": "tcp",
        "VirtualAddress": "",
        "InstanceID": 0,
        "ProxyPort": 5042
      },
      "ActiveWriters": 2,
      "CreatedAt": "2014-11-10T03:24:16.487668247Z"
    },
    "127.0.0.1:5042        10.87.110.39    \u003c-- 172.17.42.1     172.17.2.118:34134   ": {
      "AgentHostIP": "10.87.110.39",
      "AgentHostID": "570a276e",
      "Src": {
        "AgentHostIP": "172.17.42.1",
        "AgentHostID": "570a276e",
        "ServiceName": "ZooKeeper",
        "TenantID": "91arc9qqzbyb07r45wo9l3om5",
        "ServiceID": "dupxi7eorduknqzmcoo7c5imn",
        "InstanceID": "0",
        "ContainerIP": "172.17.2.118",
        "ContainerID": "dc7df5cfd557"
      },
      "SrcRemoteAddr": "172.17.2.118:34134",
      "SrcLocalAddr": "10.87.110.39:22250",
      "DstLocalAddr": "127.0.0.1:52802",
      "DstRemoteAddr": "127.0.0.1:5042",
      "DstName": "91arc9qqzbyb07r45wo9l3om5_controlplane_logstash_tcp",
      "ApplicationEndpoint": {
        "ServiceID": "controlplane_logstash_tcp",
        "Application": "controlplane_logstash_tcp",
        "ContainerPort": 5042,
        "HostPort": 5042,
        "HostIP": "10.87.110.39",
        "ContainerIP": "127.0.0.1",
        "Protocol": "tcp",
        "VirtualAddress": "",
        "InstanceID": 0,
        "ProxyPort": 5042
      },
      "ActiveWriters": 2,
      "CreatedAt": "2014-11-10T03:24:19.906142441Z"
    },
    "127.0.0.1:5043        10.87.110.39    \u003c-- 172.17.42.1     172.17.2.114:38590   ": {
      "AgentHostIP": "10.87.110.39",
      "AgentHostID": "570a276e",
      "Src": {
        "AgentHostIP": "172.17.42.1",
        "AgentHostID": "570a276e",
        "ServiceName": "HMaster",
        "TenantID": "91arc9qqzbyb07r45wo9l3om5",
        "ServiceID": "449nwijlzmg81vw6lex42uohj",
        "InstanceID": "0",
        "ContainerIP": "172.17.2.114",
        "ContainerID": "09d57f971436"
      },
      "SrcRemoteAddr": "172.17.2.114:38590",
      "SrcLocalAddr": "10.87.110.39:22250",
      "DstLocalAddr": "127.0.0.1:39844",
      "DstRemoteAddr": "127.0.0.1:5043",
      "DstName": "91arc9qqzbyb07r45wo9l3om5_controlplane_logstash_lumberjack",
      "ApplicationEndpoint": {
        "ServiceID": "controlplane_logstash_lumberjack",
        "Application": "controlplane_logstash_lumberjack",
        "ContainerPort": 5043,
        "HostPort": 5043,
        "HostIP": "10.87.110.39",
        "ContainerIP": "127.0.0.1",
        "Protocol": "tcp",
        "VirtualAddress": "",
        "InstanceID": 0,
        "ProxyPort": 5043
      },
      "ActiveWriters": 2,
      "CreatedAt": "2014-11-10T03:24:16.295112237Z"
    },
    "127.0.0.1:5043        10.87.110.39    \u003c-- 172.17.42.1     172.17.2.116:54588   ": {
      "AgentHostIP": "10.87.110.39",
      "AgentHostID": "570a276e",
      "Src": {
        "AgentHostIP": "172.17.42.1",
        "AgentHostID": "570a276e",
        "ServiceName": "RegionServer",
        "TenantID": "91arc9qqzbyb07r45wo9l3om5",
        "ServiceID": "83eg2eskvnz4qolgx5nxjl52o",
        "InstanceID": "0",
        "ContainerIP": "172.17.2.116",
        "ContainerID": "d517ce7a8192"
      },
      "SrcRemoteAddr": "172.17.2.116:54588",
      "SrcLocalAddr": "10.87.110.39:22250",
      "DstLocalAddr": "127.0.0.1:39838",
      "DstRemoteAddr": "127.0.0.1:5043",
      "DstName": "91arc9qqzbyb07r45wo9l3om5_controlplane_logstash_lumberjack",
      "ApplicationEndpoint": {
        "ServiceID": "controlplane_logstash_lumberjack",
        "Application": "controlplane_logstash_lumberjack",
        "ContainerPort": 5043,
        "HostPort": 5043,
        "HostIP": "10.87.110.39",
        "ContainerIP": "127.0.0.1",
        "Protocol": "tcp",
        "VirtualAddress": "",
        "InstanceID": 0,
        "ProxyPort": 5043
      },
      "ActiveWriters": 2,
      "CreatedAt": "2014-11-10T03:24:15.742433062Z"
    },
    "127.0.0.1:5043        10.87.110.39    \u003c-- 172.17.42.1     172.17.2.118:34129   ": {
      "AgentHostIP": "10.87.110.39",
      "AgentHostID": "570a276e",
      "Src": {
        "AgentHostIP": "172.17.42.1",
        "AgentHostID": "570a276e",
        "ServiceName": "ZooKeeper",
        "TenantID": "91arc9qqzbyb07r45wo9l3om5",
        "ServiceID": "dupxi7eorduknqzmcoo7c5imn",
        "InstanceID": "0",
        "ContainerIP": "172.17.2.118",
        "ContainerID": "dc7df5cfd557"
      },
      "SrcRemoteAddr": "172.17.2.118:34129",
      "SrcLocalAddr": "10.87.110.39:22250",
      "DstLocalAddr": "127.0.0.1:39876",
      "DstRemoteAddr": "127.0.0.1:5043",
      "DstName": "91arc9qqzbyb07r45wo9l3om5_controlplane_logstash_lumberjack",
      "ApplicationEndpoint": {
        "ServiceID": "controlplane_logstash_lumberjack",
        "Application": "controlplane_logstash_lumberjack",
        "ContainerPort": 5043,
        "HostPort": 5043,
        "HostIP": "10.87.110.39",
        "ContainerIP": "127.0.0.1",
        "Protocol": "tcp",
        "VirtualAddress": "",
        "InstanceID": 0,
        "ProxyPort": 5043
      },
      "ActiveWriters": 2,
      "CreatedAt": "2014-11-10T03:24:19.109569212Z"
    },
    "127.0.0.1:8443        10.87.110.39    \u003c-- 172.17.42.1     172.17.2.114:38646   ": {
      "AgentHostIP": "10.87.110.39",
      "AgentHostID": "570a276e",
      "Src": {
        "AgentHostIP": "172.17.42.1",
        "AgentHostID": "570a276e",
        "ServiceName": "HMaster",
        "TenantID": "91arc9qqzbyb07r45wo9l3om5",
        "ServiceID": "449nwijlzmg81vw6lex42uohj",
        "InstanceID": "0",
        "ContainerIP": "172.17.2.114",
        "ContainerID": "09d57f971436"
      },
      "SrcRemoteAddr": "172.17.2.114:38646",
      "SrcLocalAddr": "10.87.110.39:22250",
      "DstLocalAddr": "127.0.0.1:54440",
      "DstRemoteAddr": "127.0.0.1:8443",
      "DstName": "91arc9qqzbyb07r45wo9l3om5_controlplane_consumer",
      "ApplicationEndpoint": {
        "ServiceID": "controlplane_consumer",
        "Application": "controlplane_consumer",
        "ContainerPort": 8443,
        "HostPort": 8443,
        "HostIP": "10.87.110.39",
        "ContainerIP": "127.0.0.1",
        "Protocol": "tcp",
        "VirtualAddress": "",
        "InstanceID": 0,
        "ProxyPort": 8444
      },
      "ActiveWriters": 2,
      "CreatedAt": "2014-11-10T03:24:23.004620538Z"
    },
    "127.0.0.1:8443        10.87.110.39    \u003c-- 172.17.42.1     172.17.2.116:54680   ": {
      "AgentHostIP": "10.87.110.39",
      "AgentHostID": "570a276e",
      "Src": {
        "AgentHostIP": "172.17.42.1",
        "AgentHostID": "570a276e",
        "ServiceName": "RegionServer",
        "TenantID": "91arc9qqzbyb07r45wo9l3om5",
        "ServiceID": "83eg2eskvnz4qolgx5nxjl52o",
        "InstanceID": "0",
        "ContainerIP": "172.17.2.116",
        "ContainerID": "d517ce7a8192"
      },
      "SrcRemoteAddr": "172.17.2.116:54680",
      "SrcLocalAddr": "10.87.110.39:22250",
      "DstLocalAddr": "127.0.0.1:54470",
      "DstRemoteAddr": "127.0.0.1:8443",
      "DstName": "91arc9qqzbyb07r45wo9l3om5_controlplane_consumer",
      "ApplicationEndpoint": {
        "ServiceID": "controlplane_consumer",
        "Application": "controlplane_consumer",
        "ContainerPort": 8443,
        "HostPort": 8443,
        "HostIP": "10.87.110.39",
        "ContainerIP": "127.0.0.1",
        "Protocol": "tcp",
        "VirtualAddress": "",
        "InstanceID": 0,
        "ProxyPort": 8444
      },
      "ActiveWriters": 2,
      "CreatedAt": "2014-11-10T03:24:28.534814753Z"
    },
    "127.0.0.1:8443        10.87.110.39    \u003c-- 172.17.42.1     172.17.2.118:34192   ": {
      "AgentHostIP": "10.87.110.39",
      "AgentHostID": "570a276e",
      "Src": {
        "AgentHostIP": "172.17.42.1",
        "AgentHostID": "570a276e",
        "ServiceName": "ZooKeeper",
        "TenantID": "91arc9qqzbyb07r45wo9l3om5",
        "ServiceID": "dupxi7eorduknqzmcoo7c5imn",
        "InstanceID": "0",
        "ContainerIP": "172.17.2.118",
        "ContainerID": "dc7df5cfd557"
      },
      "SrcRemoteAddr": "172.17.2.118:34192",
      "SrcLocalAddr": "10.87.110.39:22250",
      "DstLocalAddr": "127.0.0.1:54479",
      "DstRemoteAddr": "127.0.0.1:8443",
      "DstName": "91arc9qqzbyb07r45wo9l3om5_controlplane_consumer",
      "ApplicationEndpoint": {
        "ServiceID": "controlplane_consumer",
        "Application": "controlplane_consumer",
        "ContainerPort": 8443,
        "HostPort": 8443,
        "HostIP": "10.87.110.39",
        "ContainerIP": "127.0.0.1",
        "Protocol": "tcp",
        "VirtualAddress": "",
        "InstanceID": 0,
        "ProxyPort": 8444
      },
      "ActiveWriters": 2,
      "CreatedAt": "2014-11-10T03:24:33.936868662Z"
    },
    "172.17.2.114:60000    10.87.110.39    \u003c-- 172.17.42.1     172.17.2.116:57353   ": {
      "AgentHostIP": "10.87.110.39",
      "AgentHostID": "570a276e",
      "Src": {
        "AgentHostIP": "172.17.42.1",
        "AgentHostID": "570a276e",
        "ServiceName": "RegionServer",
        "TenantID": "91arc9qqzbyb07r45wo9l3om5",
        "ServiceID": "83eg2eskvnz4qolgx5nxjl52o",
        "InstanceID": "0",
        "ContainerIP": "172.17.2.116",
        "ContainerID": "d517ce7a8192"
      },
      "SrcRemoteAddr": "172.17.2.116:57353",
      "SrcLocalAddr": "172.17.42.1:22250",
      "DstLocalAddr": "172.17.42.1:42591",
      "DstRemoteAddr": "172.17.2.114:60000",
      "DstName": "91arc9qqzbyb07r45wo9l3om5_hbase-master-1",
      "ApplicationEndpoint": {
        "ServiceID": "449nwijlzmg81vw6lex42uohj",
        "Application": "hbase-master-1",
        "ContainerPort": 60000,
        "HostPort": 49485,
        "HostIP": "172.17.42.1",
        "ContainerIP": "172.17.2.114",
        "Protocol": "tcp",
        "VirtualAddress": "",
        "InstanceID": 0,
        "ProxyPort": 60000
      },
      "ActiveWriters": 2,
      "CreatedAt": "2014-11-10T03:24:39.157577991Z"
    },
    "172.17.2.118:2181     10.87.110.39    \u003c-- 172.17.42.1     172.17.2.114:33984   ": {
      "AgentHostIP": "10.87.110.39",
      "AgentHostID": "570a276e",
      "Src": {
        "AgentHostIP": "172.17.42.1",
        "AgentHostID": "570a276e",
        "ServiceName": "HMaster",
        "TenantID": "91arc9qqzbyb07r45wo9l3om5",
        "ServiceID": "449nwijlzmg81vw6lex42uohj",
        "InstanceID": "0",
        "ContainerIP": "172.17.2.114",
        "ContainerID": "09d57f971436"
      },
      "SrcRemoteAddr": "172.17.2.114:33984",
      "SrcLocalAddr": "172.17.42.1:22250",
      "DstLocalAddr": "172.17.42.1:42923",
      "DstRemoteAddr": "172.17.2.118:2181",
      "DstName": "91arc9qqzbyb07r45wo9l3om5_zookeeper-client_0",
      "ApplicationEndpoint": {
        "ServiceID": "dupxi7eorduknqzmcoo7c5imn",
        "Application": "zookeeper-client",
        "ContainerPort": 2181,
        "HostPort": 49490,
        "HostIP": "172.17.42.1",
        "ContainerIP": "172.17.2.118",
        "Protocol": "tcp",
        "VirtualAddress": "",
        "InstanceID": 0,
        "ProxyPort": 2181
      },
      "ActiveWriters": 2,
      "CreatedAt": "2014-11-10T03:24:22.814427573Z"
    },
    "172.17.2.118:2181     10.87.110.39    \u003c-- 172.17.42.1     172.17.2.114:34003   ": {
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}
```