CBQE-1541: cancel tuq query

Change-Id: Idb5d12bf15d0026a3b63b2887a26359e0896df29
Reviewed-on: http://review.couchbase.org/29388
Reviewed-by: Ketaki Gangal <ketakigangal@gmail.com>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>