Adding replication consistency group capabilities for ds8k driver.
Supported operations:
* Create volume and put it into replication consistency group
* Adjust existing replication consistency group
* Enable replication on group
* Disable replication on group
* Fail over replication group back and forth
* Get error info for replicated groups and its volumes
DocImpact
Implements: blueprint replication-cg-ds8k
Depends-On: Ibd98fa3246118aa6ad5d86ecbfe46ae78de87716
Change-Id: I87c9554e5d96e1a9356a7b9f760794bfd419898e