CBQE-1012: fix alert test

Change-Id: I6b4f7c333284202f607f7bd1baa9153dd8322aee
Reviewed-on: http://review.couchbase.org/25703
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Deepkaran Salooja <deepkaran.salooja@globallogic.com>