Add support for password parameters

Change-Id: Iaab1d59c6e01fb95f5c8cd012dbc73379c92174e
Reviewed-on: https://review.openstack.org/26317
Reviewed-by: Monty Taylor <mordred@inaugust.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Approved: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins