Disable building of the generated tests

Change-Id: I7d936bd7a296aa45100ad6ddf7f4e698cedd9781
Reviewed-on: http://review.couchbase.org/30667
Tested-by: Trond Norbye <trond.norbye@gmail.com>
Reviewed-by: Michael Wiederhold <mike@couchbase.com>
Tested-by: Michael Wiederhold <mike@couchbase.com>