Updated openstack/openstack
Project: openstack/trove  99d0e16100531bfe4056081b6d4ed39062ad824d

cluster_config argument missing in prepare()

Due to a bad merge, the prepare() call in postgresql does
not have cluster_config argument. Added that to make sure
postgres is in line with other data stores.

Change-Id: I1c3e5032447124dae47ae23ebf820fdcf8080588
Closes-Bug: #1380745