CBQE-1531: add xdcr+tuq+rebalance tests

Change-Id: I470a156a9abb4e7b1a935fc622ece1d919e98279
Reviewed-on: http://review.couchbase.org/29543
Reviewed-by: Ketaki Gangal <ketakigangal@gmail.com>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>