CBQE-0 :: implement tests for requireDeltaRecoveryBuckets

Change-Id: I5d5bfe4b682281702184b9cb31215560f266ddb1
Reviewed-on: http://review.couchbase.org/38822
Reviewed-by: Parag Agarwal <agarwal.parag@gmail.com>
Tested-by: Parag Agarwal <agarwal.parag@gmail.com>