Set volume status properly, first pass at validation decorators.
Set volume status properly, first pass at validation decorators.

rackerlabs/melange,rajarammallya/melange,openstack-attic/melange,openstack-attic/melange,openstack-attic/melange,rajarammallya/melange,rajarammallya/melange,rackerlabs/melange,rackerlabs/melange