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

...method

Parts 1 and 2 out of 4 from:
  https://jira.zenoss.com/browse/CC-406

DEMO - serviced.log GET for https://plu-9/mux/connections:
```
I1110 03:42:22.864883 24755 cpserver.go:219] start getMasterClient ... sc.agentPort: 10.87.110.39:4979
I1110 03:42:22.865274 24755 cpserver.go:225] end getMasterClient
I1110 03:42:22.925240 24755 muxresource.go:73] mux connections (count:18) for host: 570a276e 172.17.42.1
I1110 03:42:22.925306 24755 muxresource.go:87]   10.87.110.39    127.0.0.1:5042        <-- 172.17.42.1     172.17.2.122:34669     (controlplane_logstash_tcp/0 <-- HMaster/0) (controlplane_logstash_tcp <-- 3ogmr9ckmz1bd8md4v1e9bm0q) 59.187184116s
I1110 03:42:22.925344 24755 muxresource.go:87]   10.87.110.39    127.0.0.1:5042        <-- 172.17.42.1     172.17.2.124:34379     (controlplane_logstash_tcp/0 <-- RegionServer/0) (controlplane_logstash_tcp <-- a186ztd8o0tf7umnh8dm2kyhs) 53.744595441s
I1110 03:42:22.925368 24755 muxresource.go:87]   10.87.110.39    127.0.0.1:5042        <-- 172.17.42.1     172.17.2.126:32992     (controlplane_logstash_tcp/0 <-- ZooKeeper/0) (controlplane_logstash_tcp <-- 25gv1gky1urcg40t08aeyv8bk) 48.341200924s
I1110 03:42:22.925400 24755 muxresource.go:87]   10.87.110.39    127.0.0.1:5043        <-- 172.17.42.1     172.17.2.122:34666     (controlplane_logstash_lumberjack/0 <-- HMaster/0) (controlplane_logstash_lumberjack <-- 3ogmr9ckmz1bd8md4v1e9bm0q) 59.941005092s
I1110 03:42:22.925435 24755 muxresource.go:87]   10.87.110.39    127.0.0.1:5043        <-- 172.17.42.1     172.17.2.124:34375     (controlplane_logstash_lumberjack/0 <-- RegionServer/0) (controlplane_logstash_lumberjack <-- a186ztd8o0tf7umnh8dm2kyhs) 54.507316953s
I1110 03:42:22.925480 24755 muxresource.go:87]   10.87.110.39    127.0.0.1:5043        <-- 172.17.42.1     172.17.2.126:32988     (controlplane_logstash_lumberjack/0 <-- ZooKeeper/0) (controlplane_logstash_lumberjack <-- 25gv1gky1urcg40t08aeyv8bk) 49.097791805s
I1110 03:42:22.925503 24755 muxresource.go:87]   10.87.110.39    127.0.0.1:8443        <-- 172.17.42.1     172.17.2.122:34744     (controlplane_consumer/0 <-- HMaster/0) (controlplane_consumer <-- 3ogmr9ckmz1bd8md4v1e9bm0q) 45.131206s
I1110 03:42:22.925536 24755 muxresource.go:87]   10.87.110.39    127.0.0.1:8443        <-- 172.17.42.1     172.17.2.124:34459     (controlplane_consumer/0 <-- RegionServer/0) (controlplane_consumer <-- a186ztd8o0tf7umnh8dm2kyhs) 39.699861073s
I1110 03:42:22.925566 24755 muxresource.go:87]   10.87.110.39    127.0.0.1:8443        <-- 172.17.42.1     172.17.2.126:33050     (controlplane_consumer/0 <-- ZooKeeper/0) (controlplane_consumer <-- 25gv1gky1urcg40t08aeyv8bk) 34.297797289s
I1110 03:42:22.925587 24755 muxresource.go:87]   10.87.110.39    172.17.2.122:60000    <-- 172.17.42.1     172.17.2.124:33308     (hbase-master-1/0 <-- RegionServer/0) (3ogmr9ckmz1bd8md4v1e9bm0q <-- a186ztd8o0tf7umnh8dm2kyhs) 29.244616106s
I1110 03:42:22.925617 24755 muxresource.go:87]   10.87.110.39    172.17.2.126:2181     <-- 172.17.42.1     172.17.2.122:36018     (zookeeper-client/0 <-- HMaster/0) (25gv1gky1urcg40t08aeyv8bk <-- 3ogmr9ckmz1bd8md4v1e9bm0q) 45.139280515s
I1110 03:42:22.925649 24755 muxresource.go:87]   10.87.110.39    172.17.2.126:2181     <-- 172.17.42.1     172.17.2.122:36037     (zookeeper-client/0 <-- HMaster/0) (25gv1gky1urcg40t08aeyv8bk <-- 3ogmr9ckmz1bd8md4v1e9bm0q) 43.785697261s
I1110 03:42:22.925671 24755 muxresource.go:87]   10.87.110.39    172.17.2.126:2181     <-- 172.17.42.1     172.17.2.122:36040     (zookeeper-client/0 <-- HMaster/0) (25gv1gky1urcg40t08aeyv8bk <-- 3ogmr9ckmz1bd8md4v1e9bm0q) 43.612520649s
I1110 03:42:22.925697 24755 muxresource.go:87]   10.87.110.39    172.17.2.126:2181     <-- 172.17.42.1     172.17.2.122:36043     (zookeeper-client/0 <-- HMaster/0) (25gv1gky1urcg40t08aeyv8bk <-- 3ogmr9ckmz1bd8md4v1e9bm0q) 43.123374139s
I1110 03:42:22.925719 24755 muxresource.go:87]   10.87.110.39    172.17.2.126:2181     <-- 172.17.42.1     172.17.2.124:33303     (zookeeper-client/0 <-- RegionServer/0) (25gv1gky1urcg40t08aeyv8bk <-- a186ztd8o0tf7umnh8dm2kyhs) 29.629740941s
I1110 03:42:22.925741 24755 muxresource.go:87]   10.87.110.39    172.17.2.126:2181     <-- 172.17.42.1     172.17.2.124:33306     (zookeeper-client/0 <-- RegionServer/0) (25gv1gky1urcg40t08aeyv8bk <-- a186ztd8o0tf7umnh8dm2kyhs) 29.524126431s
I1110 03:42:22.925762 24755 muxresource.go:87]   10.87.110.39    172.17.2.126:2181     <-- 172.17.42.1     172.17.2.124:33313     (zookeeper-client/0 <-- RegionServer/0) (25gv1gky1urcg40t08aeyv8bk <-- a186ztd8o0tf7umnh8dm2kyhs) 29.051177271s
I1110 03:42:22.925788 24755 muxresource.go:87]   10.87.110.39    172.17.2.126:2181     <-- 172.17.42.1     172.17.2.124:33316     (zookeeper-client/0 <-- RegionServer/0) (25gv1gky1urcg40t08aeyv8bk <-- a186ztd8o0tf7umnh8dm2kyhs) 28.974835554s
2014/11/10 03:42:22 200 62.075879ms GET /mux/connections
```

DEMO - https://plu-9/mux/connections:
```
{
  "570a276e": {
    "10.87.110.39    127.0.0.1:5042        \u003c-- 172.17.42.1     172.17.2.122:34669   ": {
      "AgentHostIP": "10.87.110.39",
      "AgentHostID": "570a276e",
      "Src": {
        "AgentHostIP": "172.17.42.1",
        "AgentHostID": "570a276e",
        "ServiceName": "HMaster",
        "TenantID": "azjzj20363xgoj8gv2bnrr9ho",
        "ServiceID": "3ogmr9ckmz1bd8md4v1e9bm0q",
        "InstanceID": "0",
        "ContainerIP": "172.17.2.122",
        "ContainerID": "41b1ecc7dcb3"
      },
      "SrcRemoteAddr": "172.17.2.122:34669",
      "SrcLocalAddr": "10.87.110.39:22250",
      "DstLocalAddr": "127.0.0.1:54129",
      "DstRemoteAddr": "127.0.0.1:5042",
      "DstName": "azjzj20363xgoj8gv2bnrr9ho_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": "2014-11-10T03:41:23.738121414Z"
    },
    "10.87.110.39    127.0.0.1:5042        \u003c-- 172.17.42.1     172.17.2.124:34379   ": {
      "AgentHostIP": "10.87.110.39",
      "AgentHostID": "570a276e",
      "Src": {
        "AgentHostIP": "172.17.42.1",
        "AgentHostID": "570a276e",
        "ServiceName": "RegionServer",
        "TenantID": "azjzj20363xgoj8gv2bnrr9ho",
        "ServiceID": "a186ztd8o0tf7umnh8dm2kyhs",
        "InstanceID": "0",
        "ContainerIP": "172.17.2.124",
        "ContainerID": "4c40c95337b6"
      },
      "SrcRemoteAddr": "172.17.2.124:34379",
      "SrcLocalAddr": "10.87.110.39:22250",
      "DstLocalAddr": "127.0.0.1:54153",
      "DstRemoteAddr": "127.0.0.1:5042",
      "DstName": "azjzj20363xgoj8gv2bnrr9ho_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": "2014-11-10T03:41:29.180748271Z"
    },
    "10.87.110.39    127.0.0.1:5042        \u003c-- 172.17.42.1     172.17.2.126:32992   ": {
      "AgentHostIP": "10.87.110.39",
      "AgentHostID": "570a276e",
      "Src": {
        "AgentHostIP": "172.17.42.1",
        "AgentHostID": "570a276e",
        "ServiceName": "ZooKeeper",
        "TenantID": "azjzj20363xgoj8gv2bnrr9ho",
        "ServiceID": "25gv1gky1urcg40t08aeyv8bk",
        "InstanceID": "0",
        "ContainerIP": "172.17.2.126",
        "ContainerID": "535d2572b3a7"
      },
      "SrcRemoteAddr": "172.17.2.126:32992",
      "SrcLocalAddr": "10.87.110.39:22250",
      "DstLocalAddr": "127.0.0.1:54185",
      "DstRemoteAddr": "127.0.0.1:5042",
      "DstName": "azjzj20363xgoj8gv2bnrr9ho_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": "2014-11-10T03:41:34.584166659Z"
    },
    "10.87.110.39    127.0.0.1:5043        \u003c-- 172.17.42.1     172.17.2.122:34666   ": {
      "AgentHostIP": "10.87.110.39",
      "AgentHostID": "570a276e",
      "Src": {
        "AgentHostIP": "172.17.42.1",
        "AgentHostID": "570a276e",
        "ServiceName": "HMaster",
        "TenantID": "azjzj20363xgoj8gv2bnrr9ho",
        "ServiceID": "3ogmr9ckmz1bd8md4v1e9bm0q",
        "InstanceID": "0",
        "ContainerIP": "172.17.2.122",
        "ContainerID": "41b1ecc7dcb3"
      },
      "SrcRemoteAddr": "172.17.2.122:34666",
      "SrcLocalAddr": "10.87.110.39:22250",
      "DstLocalAddr": "127.0.0.1:41205",
      "DstRemoteAddr": "127.0.0.1:5043",
      "DstName": "azjzj20363xgoj8gv2bnrr9ho_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": "2014-11-10T03:41:22.984394821Z"
    },
    "10.87.110.39    127.0.0.1:5043        \u003c-- 172.17.42.1     172.17.2.124:34375   ": {
      "AgentHostIP": "10.87.110.39",
      "AgentHostID": "570a276e",
      "Src": {
        "AgentHostIP": "172.17.42.1",
        "AgentHostID": "570a276e",
        "ServiceName": "RegionServer",
        "TenantID": "azjzj20363xgoj8gv2bnrr9ho",
        "ServiceID": "a186ztd8o0tf7umnh8dm2kyhs",
        "InstanceID": "0",
        "ContainerIP": "172.17.2.124",
        "ContainerID": "4c40c95337b6"
      },
      "SrcRemoteAddr": "172.17.2.124:34375",
      "SrcLocalAddr": "10.87.110.39:22250",
      "DstLocalAddr": "127.0.0.1:41228",
      "DstRemoteAddr": "127.0.0.1:5043",
      "DstName": "azjzj20363xgoj8gv2bnrr9ho_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": "2014-11-10T03:41:28.418117965Z"
    },
    "10.87.110.39    127.0.0.1:5043        \u003c-- 172.17.42.1     172.17.2.126:32988   ": {
      "AgentHostIP": "10.87.110.39",
      "AgentHostID": "570a276e",
      "Src": {
        "AgentHostIP": "172.17.42.1",
        "AgentHostID": "570a276e",
        "ServiceName": "ZooKeeper",
        "TenantID": "azjzj20363xgoj8gv2bnrr9ho",
        "ServiceID": "25gv1gky1urcg40t08aeyv8bk",
        "InstanceID": "0",
        "ContainerIP": "172.17.2.126",
        "ContainerID": "535d2572b3a7"
      },
      "SrcRemoteAddr": "172.17.2.126:32988",
      "SrcLocalAddr": "10.87.110.39:22250",
      "DstLocalAddr": "127.0.0.1:41260",
      "DstRemoteAddr": "127.0.0.1:5043",
      "DstName": "azjzj20363xgoj8gv2bnrr9ho_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": "2014-11-10T03:41:33.827688113Z"
    },
    "10.87.110.39    127.0.0.1:8443        \u003c-- 172.17.42.1     172.17.2.122:34744   ": {
      "AgentHostIP": "10.87.110.39",
      "AgentHostID": "570a276e",
      "Src": {
        "AgentHostIP": "172.17.42.1",
        "AgentHostID": "570a276e",
        "ServiceName": "HMaster",
        "TenantID": "azjzj20363xgoj8gv2bnrr9ho",
        "ServiceID": "3ogmr9ckmz1bd8md4v1e9bm0q",
        "InstanceID": "0",
        "ContainerIP": "172.17.2.122",
        "ContainerID": "41b1ecc7dcb3"
      },
      "SrcRemoteAddr": "172.17.2.122:34744",
      "SrcLocalAddr": "10.87.110.39:22250",
      "DstLocalAddr": "127.0.0.1:55824",
      "DstRemoteAddr": "127.0.0.1:8443",
      "DstName": "azjzj20363xgoj8gv2bnrr9ho_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": "2014-11-10T03:41:37.794296782Z"
    },
    "10.87.110.39    127.0.0.1:8443        \u003c-- 172.17.42.1     172.17.2.124:34459   ": {
      "AgentHostIP": "10.87.110.39",
      "AgentHostID": "570a276e",
      "Src": {
        "AgentHostIP": "172.17.42.1",
        "AgentHostID": "570a276e",
        "ServiceName": "RegionServer",
        "TenantID": "azjzj20363xgoj8gv2bnrr9ho",
        "ServiceID": "a186ztd8o0tf7umnh8dm2kyhs",
        "InstanceID": "0",
        "ContainerIP": "172.17.2.124",
        "ContainerID": "4c40c95337b6"
      },
      "SrcRemoteAddr": "172.17.2.124:34459",
      "SrcLocalAddr": "10.87.110.39:22250",
      "DstLocalAddr": "127.0.0.1:55852",
      "DstRemoteAddr": "127.0.0.1:8443",
      "DstName": "azjzj20363xgoj8gv2bnrr9ho_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": "2014-11-10T03:41:43.225674467Z"
    },
    "10.87.110.39    127.0.0.1:8443        \u003c-- 172.17.42.1     172.17.2.126:33050   ": {
      "AgentHostIP": "10.87.110.39",
      "AgentHostID": "570a276e",
      "Src": {
        "AgentHostIP": "172.17.42.1",
        "AgentHostID": "570a276e",
        "ServiceName": "ZooKeeper",
        "TenantID": "azjzj20363xgoj8gv2bnrr9ho",
        "ServiceID": "25gv1gky1urcg40t08aeyv8bk",
        "InstanceID": "0",
        "ContainerIP": "172.17.2.126",
        "ContainerID": "535d2572b3a7"
      },
      "SrcRemoteAddr": "172.17.2.126:33050",
      "SrcLocalAddr": "10.87.110.39:22250",
      "DstLocalAddr": "127.0.0.1:55862",
      "DstRemoteAddr": "127.0.0.1:8443",
      "DstName": "azjzj20363xgoj8gv2bnrr9ho_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": "2014-11-10T03:41:48.627768446Z"
    },
    "10.87.110.39    172.17.2.122:60000    \u003c-- 172.17.42.1     172.17.2.124:33308   ": {
      "AgentHostIP": "10.87.110.39",
      "AgentHostID": "570a276e",
      "Src": {
        "AgentHostIP": "172.17.42.1",
        "AgentHostID": "570a276e",
        "ServiceName": "RegionServer",
        "TenantID": "azjzj20363xgoj8gv2bnrr9ho",
        "ServiceID": "a186ztd8o0tf7umnh8dm2kyhs",
        "InstanceID": "0",
        "ContainerIP": "172.17.2.124",
        "ContainerID": "4c40c95337b6"
      },
      "SrcRemoteAddr": "172.17.2.124:33308",
      "SrcLocalAddr": "172.17.42.1:22250",
      "DstLocalAddr": "172.17.42.1:36073",
      "DstRemoteAddr": "172.17.2.122:60000",
      "DstName": "azjzj20363xgoj8gv2bnrr9ho_hbase-master-1",
      "ApplicationEndpoint": {
        "ServiceID": "3ogmr9ckmz1bd8md4v1e9bm0q",
        "Application": "hbase-master-1",
        "ContainerPort": 60000,
        "HostPort": 49493,
        "HostIP": "172.17.42.1",
        "ContainerIP": "172.17.2.122",
        "Protocol": "tcp",
        "VirtualAddress": "",
        "InstanceID": 0,
        "ProxyPort": 60000
      },
      "ActiveWriters": 2,
      "CreatedAt": "2014-11-10T03:41:53.680970786Z"
    },
    "10.87.110.39    172.17.2.126:2181     \u003c-- 172.17.42.1     172.17.2.122:36018   ": {
      "AgentHostIP": "10.87.110.39",
      "AgentHostID": "570a276e",
      "Src": {
        "AgentHostIP": "172.17.42.1",
        "AgentHostID": "570a276e",
        "ServiceName": "HMaster",
        "TenantID": "azjzj20363xgoj8gv2bnrr9ho",
        "ServiceID": "3ogmr9ckmz1bd8md4v1e9bm0q",
        "InstanceID": "0",
        "ContainerIP": "172.17.2.122",
        "ContainerID": "41b1ecc7dcb3"
      },
      "SrcRemoteAddr": "172.17.2.122:36018",
      "SrcLocalAddr": "172.17.42.1:22250",
      "DstLocalAddr": "172.17.42.1:40612",
      "DstRemoteAddr": "172.17.2.126:2181",
      "DstName": "azjzj20363xgoj8gv2bnrr9ho_zookeeper-client_0",
      "ApplicationEndpoint": {
        "ServiceID": "25gv1gky1urcg40t08aeyv8bk",
        "Application": "zookeeper-client",
        "ContainerPort": 2181,
        "HostPort": 49499,
        "HostIP": "172.17.42.1",
        "ContainerIP": "172.17.2.126",
        "Protocol": "tcp",
        "VirtualAddress": "",
        "InstanceID": 0,
        "ProxyPort": 2181
      },
      "ActiveWriters": 2,
      "CreatedAt": "2014-11-10T03:41:37.786336148Z"
    },
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}
```