CBQE-702: add queries threads to spatial view cases

Change-Id: I34110f2c045837e608c1d4be4efa92e31694d384
Reviewed-on: http://review.couchbase.org/24049
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>