Alon Marx 9952531da4 IBM XIV/DS8K: Implement Replication v2.1 ...

This patch implements cinder Replication version 2.1 as proposed in
https://blueprints.launchpad.net/cinder/+spec/replication

The driver implements:
1. freeze_backend - notify the backend that it's frozen
2. thaw_backend - notify the backend that it's not frozen
3. host_failover - failover a backend to a secondary replication target

Also removed v1.0 and v2.0 functions

DocImpact
Change-Id: I50498180c63725ab0f524ff8d55952446800570f
Closes-Bug: #1543600

2016-03-14 17:16:10 +02:00

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