Provide password to volume create command
Provide password to volume create command

* Depending on the host configuration between the docker engine and the remote host we wish to mount using sshfs, a password may be required.
* Confirmed syntax for optional parameter with @vieux
* Verified change works as desired with engine running on Ubuntu host and mounting a volume from a file system on a Mac.

Signed-off-by: David Williamson <25bf1c3d440cb99e1c1bc5a3c1be243bb84d3811@docker.com>

ashfall/cli,e11137/cli,thaJeztah/cli,dnephin/cli,cpuguy83/cli,Zebrilee/cli,cpuguy83/cli,thaJeztah/cli,ashfall/cli,e11137/cli,redpanda/cli,riyazdf/cli,redpanda/cli,docker/cli,Zebrilee/cli,docker/cli,riyazdf/cli,allencloud/cli,dnephin/cli,allencloud/cli