fix not setting auth_host and auth_port

[amnore]

If auth_socket is not set, the plugin doesn't try to set auth_host and auth_port (because it then breaks out of the with block).

I assume this is not the intended behavior. So I added another block to fix it.

Looks like you are not using tcp socket? :)

[MatthewHana]

Plugin can not use host/port without this fix. Pull request should be approved.