n1ql: Don't retry if cancelled
n1ql: Don't retry if cancelled

Was looking through the code, saw this might happen

Change-Id: Ibabf3fbc41464ac357b48687c1428993413bcecf
Reviewed-on: http://review.couchbase.org/54858
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Subhashni Balakrishnan <7129c8e37b832c7bd362ff375532d24b98ef5162@gmail.com>

signmotion/libcouchbase,kojiromike/libcouchbase,maxim-ky/libcouchbase,couchbase/libcouchbase,maxim-ky/libcouchbase,mody/libcouchbase,kojiromike/libcouchbase,maxim-ky/libcouchbase,maxim-ky/libcouchbase,mody/libcouchbase,signmotion/libcouchbase,kojiromike/libcouchbase,avsej/libcouchbase,avsej/libcouchbase,kojiromike/libcouchbase,avsej/libcouchbase,couchbase/libcouchbase,avsej/libcouchbase,mody/libcouchbase,avsej/libcouchbase,signmotion/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase,signmotion/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase,avsej/libcouchbase,mody/libcouchbase,avsej/libcouchbase