Fix RBDDriver in volume manager. discover_volume was raising exception. Modified local_path as well.
Fix RBDDriver in volume manager. discover_volume was raising exception.
Modified local_path as well.

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