Added missing san_private_key parameter used for password less SSH
authentication.
Change-Id: I6d7544b525055318aa567f9cbbe318d82bafacf0
Depends-On: 70db86d3366f85edf563aa73c533931a21cfab4d
Updated the heat templates for Cinder Dell EMC PS Series backend
to use composable services and rebranding of EQLX to Dell EMC PS Series
Closes-Bug: #1661313
Change-Id: Id9d6f172f3f79a31788b26c7776d738fda5a30fa