makes listServers api more informative

API: cluster/servers  

query the api will get result looks like this: 

    ...
    {
    id: 1
    isLeader: true
    isUp: true
    leaderConnectString: http://opsdevhdp02:8090
    leaderRaftName: "813f022eeb23284b"
    protobufConnectString: "opsdevhdp02:8099"
    raftConnectionString: http://opsdevhdp02:8090
    raftName: "813f022eeb23284b"
    state: 4
    stateName: "Potential"
    }
    -{
    id: 2
    isLeader: false
    isUp: false
    leaderConnectString: http://opsdevhdp02:8090
    leaderRaftName: "813f022eeb23284b"
    protobufConnectString: "opsdevhdp01:8099"
    raftConnectionString: http://opsdevhdp01:8090
    raftName: "4368e5809eef133a"
    state: 4
    stateName: "Potential"
    }
    ...