MB-10652: Uncomment the notifier test

I resolved the issue that was causing this test to fail in
memcached.

Change-Id: Ia6b336375d40cc57b443cbcb3ade614808ec00e5
Reviewed-on: http://review.couchbase.org/36656
Reviewed-by: abhinav dangeti <abhinav@couchbase.com>
Tested-by: Michael Wiederhold <mike@couchbase.com>