Support SSH Authentication for Docker Container Driver

[byt3bl33d3r]

As of docker 18.09 you can connect to a remote docker daemon over SSH without actually exposing the daemon socket and/or configuring TLS certs. (see https://docs.docker.com/engine/reference/commandline/dockerd/#daemon-socket-option)

e.g. docker -H ssh://remoteip ps -a

It would be fantastic if support for this could be added into the Docker driver.

Cheers

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