This change adds database support to the python-openstackclient
project for the promote-to-replica-source command.
The trove command promote-to-replica-source is now:
openstack database instance promote to replica source
Change-Id: I0009b3e1074ddabaed6b02f5578f28cffc995b30
Partially-Implements: blueprint trove-support-in-python-openstackclient
wangyao