CBQE-0: add memcached kill param and to exception handling

Change-Id: Ib45ebeb0fb09ea330eb68c4a29901097674018c7
Reviewed-on: http://review.couchbase.org/37395
Reviewed-by: Ketaki Gangal <ketakigangal@gmail.com>
Reviewed-by: Parag Agarwal <agarwal.parag@gmail.com>
Tested-by: Parag Agarwal <agarwal.parag@gmail.com>