Lock goforestdb in Sherlock to the current stable rev

Change-Id: I93061985c128a2d5c72c4968a2e9bcfad5e3eb3a
Reviewed-on: http://review.couchbase.org/44188
Reviewed-by: Chiyoung Seo <chiyoung@couchbase.com>
Tested-by: Chiyoung Seo <chiyoung@couchbase.com>