In VMAX driver version 3.0, SMI-S has been replaced with unisphere
REST. This is porting QoS from SMIS to REST.
See original https://review.openstack.org/#/c/307502/ for more
details
Change-Id: Iba516767a465138474832d8de487886ecf9b305f
Partially-Implements: blueprint vmax-rest