CBQE-2048 Cascading test failures after any test fails

Change-Id: I6d92a448d8f02d13ed6f352122e7112d44bf796c
Reviewed-on: http://review.couchbase.org/36699
Tested-by: Meenakshi Goel <meenakshi.goel@globallogic.com>
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Reviewed-by: Ketaki Gangal <ketakigangal@gmail.com>