CBQE-2202 fix cli failover test

Change-Id: I718600911ef2252c6dca80af3839c823f6a506ae
Reviewed-on: http://review.couchbase.org/35914
Tested-by: Thuan Nguyen <soccon@gmail.com>
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Tommie McAfee <tommie@couchbase.com>