In VMAX driver version 3.0, SMI-S has been replaced with unisphere
REST. This is porting Replication V2.1 from SMIS to REST.
See original https://review.openstack.org/#/c/409079/ for more
details
Change-Id: I9cb8d931bd40cb34429f228f1723bb162a75443f
Partially-Implements: blueprint vmax-rest
