[Pure Storage] Honour the share_name_template parameter
[Pure Storage] Honour the share_name_template parameter

No release notes required as this driver has not yet been included
in a release and all we are doing here is honouring the standard
share naming template that is documented elsewhere.

Change-Id: Id62bbfe23319f6941f37ce5eb72b511ee1bf4ebf

openstack/manila,openstack/manila