Added to devstack plugin passwords for services
Added to devstack plugin passwords for services

Drivers use neutron, and neutron auth requires password,
currently devstack does not set password by default.
Same to nova and cinder.

Change-Id: I5637b938ecbf6813111213e7e5908f456b531c7d

openstack/manila,bswartz/manila,redhat-openstack/manila,scality/manila,sajuptpm/manila,weiting-chen/manila,NetApp/manila,jcsp/manila,weiting-chen/manila,sajuptpm/manila,NetApp/manila,jcsp/manila,openstack/manila,bswartz/manila,vponomaryov/manila,vponomaryov/manila,redhat-openstack/manila,scality/manila