CBQE-0: fix kill memcached kill

Change-Id: If2abe75b005eaafe935042ec2b81e2d8ee7a74ab
Reviewed-on: http://review.couchbase.org/36824
Reviewed-by: Parag Agarwal <agarwal.parag@gmail.com>
Tested-by: Parag Agarwal <agarwal.parag@gmail.com>