Bug 1479291

Description of problem:
docker log reading feature does not respect the fact that I use external docker resource and keeps trying to connect to /var/run/docker.sock of the satellite box instead of using TCP/TLS for reaching the external docker interface.

Version-Release number of selected component (if applicable):
satellite 6.3.0-10


Steps to Reproduce:
1. have an external host running docker, configured to accept tcp/tls connections
2. add this host as a docker compute resource on satellite
3. create a container via satellite interface
4. try to use satellite to read the container logs

Actual results:
2017-08-01 17:18:26 - nailgun.client - DEBUG - Making HTTP POST request to https://sat6.com/api/v2/compute_resources with options {'verify': False, 'auth': ('admin', 'changeme'), 'headers': {'content-type': 'application/json'}}, no params and data
{
  "compute_resource": 
    {
      "provider": "Docker",
      "url": "http://10.8.29.107:2375",
      "organization_ids": [55],
      "name": "ApReidcCPN"
    }
}.
2017-08-01 17:18:26 - nailgun.client - DEBUG - Received HTTP 201 response: {"description":null,"url":"http://10.8.29.107:2375","created_at":"2017-08-01 21:18:26 UTC","updated_at":"2017-08-01 21:18:26 UTC","id":52,"name":"ApReidcCPN","provider":"Docker","provider_friendly_name":"Docker","user":null,"images":[],"compute_attributes":[],"locations":[],"organizations":[{"id":55,"name":"zcBPUXbQHi","title":"zcBPUXbQHi","description":null}]}

2017-08-01 17:18:28 - nailgun.client - DEBUG - Making HTTP POST request to https://sat6.com/docker/api/v2/containers with options {'verify': False, 'auth': ('admin', 'changeme'), 'headers': {'content-type': 'application/json'}}, no params and data

{
  "container": {
                 "repository_name": "busybox",
                 "compute_resource_id": 52,
                 "tag": "latest",
                 "command": "date",
                 "organization_ids": [55],
                 "name": "hjRR6uiV1"
                }
}.
2017-08-01 17:18:36 - nailgun.client - DEBUG - Received HTTP 201 response
2017-08-01 17:18:36 - nailgun.client - DEBUG - Making HTTP GET request to https://sat6.com/docker/api/v2/containers/9/logs with options {'verify': False, 'auth': ('admin', 'changeme'), 'headers': {'content-type': 'application/json'}}, no params and no data.
2017-08-01 17:18:36 - nailgun.client - WARNING - Received HTTP 500 response: {
  "error": {"message":"No such file or directory - connect(2) for /var/run/docker.sock (Errno::ENOENT)"}
}

Expected results:
connection is being made to the appropriate interface and the logs are being fetched

Additional info: