CBQE-0: fix for negative tests for rebalance

Change-Id: Iac2e6c39b01b472e73dd95f0a166669a70c971ae
Reviewed-on: http://review.couchbase.org/28113
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
MB-100: added new confs

Change-Id: I19bcc6927d2f21654ebc5abfe03c9348e43129f3
Reviewed-on: http://review.couchbase.org/28199
Reviewed-by: Ronnie Sun <ronnie@couchbase.com>
Tested-by: Ronnie Sun <ronnie@couchbase.com>