CBQE-2332: Add Compaction + Rebalance/Failover Tests

Change-Id: I240f1e0dd9413c392b4b3076edfe5049f245c069
Reviewed-on: http://review.couchbase.org/39624
Reviewed-by: Parag Agarwal <agarwal.parag@gmail.com>
Tested-by: Parag Agarwal <agarwal.parag@gmail.com>