ensure that inner HTTP response doesn't outlive the callback
ensure that inner HTTP response doesn't outlive the callback

Life span of the pointer to inner response might accidentally leak to
query callback (e.g. retry happened, but the query operation has timed
out)

Change-Id: Ie5959c004e858f3bd4e15d4835c05ee80322b35b
Reviewed-on: http://review.couchbase.org/c/libcouchbase/+/153040
Reviewed-by: Brett Lawson <c8c4369773d7d7226e031f0c4af62e3f38a08510@gmail.com>
Tested-by: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>

kojiromike/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase,kojiromike/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase,kojiromike/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase,kojiromike/libcouchbase