This patch adds the documentation for admins to configure
replication in OpenStack and how to recover from disaster
scenarios with failover/failback operations.
It also adds two scenarios:
1. failover/failback of boot from volume server
2. failover/failback of external data volume
Signed-off-by: Rajat Dhasmana <rajatdhasmana@gmail.com>
Change-Id: I330a0a4d56916601cd69f51d2c88a10c4c5d0166
f6e234e34b