Pass through args and kwargs in brick connectors

This is a change needed to help remove CONF usage
in the brick/remotefs/RemoteFsClient.
RemoteFsClient can then pull the values from the caller.

Change-Id: Ie1ff2a39b92c4150fec4a3191367797a260b30ec
Partial-Bug: #1230066
Merge "Pass through args and kwargs in brick connectors"