Make rabbitmq autoheal partitions

Default policy is 'ignore' and it does nothing in order
to recover from partitioning allowing many partitioned
rabbit clusters to operate as is.
Auto-heal policy will merge all partitions into the winner
one once exited from partitioned state
(e.g. connectivity restored).

Closes-bug: #1354319

Change-Id: I33823a3abfd42b75fa6bc73d6f3cd038a2163fd6
Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>
Merge "Make rabbitmq autoheal partitions"