Updated openstack/openstack
Project: openstack/python-cinderclient  3b92c27debb0325525da1ed5ecdb17cc66113801
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Add volume retype command

Add volume retype to Cinder client.
Cinder code: https://review.openstack.org/#/c/44881/

Change-Id: Ied4902da531386f744403962e4a8ddfb7587c4ef