Updated openstack/openstack
Project: openstack/python-troveclient  c6a54f7e1c21a07f7707425b7d3d6ec25e17ee5e
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Datastores improvements

Improvements for client:
- added datastore field in instances list
- fixed datastore and version fields in instance show output
- fixed mistakes in help texts
- add possibility to retrieve version by uuid (without specified datastore)

Implements: blueprint datastore-type-version-followon

Change-Id: Id41da29ce9732823bc4696301953e9cf8cdc82f5