Wrong SSH port getting used

[treydock]

On Mac OS X Docker I am now running into issues I think were introduced here: 50912bf. This is some of output I see, notice how the port trying to be used is port 22 and not the actual mapped docker port:

/containers/create
{"name"=>"clustershell-el7"}
{"Image":"0c316f4c56e8","Hostname":"centos-7","HostConfig":{"PortBindings":{"22/tcp":[{"HostPort":"5484","HostIp":"0.0.0.0"}]},"PublishAllPorts":true,"RestartPolicy":{"Name":"always"},"Privileged":true},"Env":["LANG=en_US.UTF-8","LANGUAGE=en_US.UTF-8","LC_ALL=en_US.UTF-8"]}

...

  Attempting ssh connection to 172.17.0.7, user: root, opts: {:password=>"root", :port=>"22", :forward_agent=>false, :auth_methods=>["password", "publickey", "hostbased", "keyboard-interactive"]}
  Warning: Try 1 -- Host 172.17.0.7 unreachable: Errno::ECONNREFUSED - Connection refused - connect(2) for 172.17.0.7:22
  Warning: Trying again in 3 seconds

If I downgrade to 0.7.x the issue goes away so clearly the behavior of how to find the host port changed and no longer works with all versions of Docker.