Docker host detection and information

[tas50]

Detect docker hosts by the docker binary and fetch information from Docker for a plugin.

[tas50]

Example output of the docker plugin on my Mac:

{
  "version_string": "17.12.0-ce",
  "version": "17.12.0",
  "runtimes": {
    "runc": {
      "path": "docker-runc"
    }
  },
  "root_dir": "/var/lib/docker",
  "containers": {
    "total": 11,
    "running": 0,
    "paused": 0,
    "stopped": 11
  },
  "plugins": {
    "Volume": [
      "local"
    ],
    "Network": [
      "bridge",
      "host",
      "ipvlan",
      "macvlan",
      "null",
      "overlay"
    ],
    "Authorization": null,
    "Log": [
      "awslogs",
      "fluentd",
      "gcplogs",
      "gelf",
      "journald",
      "json-file",
      "logentries",
      "splunk",
      "syslog"
    ]
  },
  "networking": {
    "ipv4_forwarding": true,
    "bridge_nf_iptables": true,
    "bridge_nf_ipv6_iptables": true
  },
  "swarm": {
    "NodeID": "",
    "NodeAddr": "",
    "LocalNodeState": "inactive",
    "ControlAvailable": false,
    "Error": "",
    "RemoteManagers": null
  }
}

[lock]

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