Freeze forestdb to same revision as sherlock

Change-Id: Ic4cb85c3a2b8892e4b880b3f7036e7b4f4e790a1
Reviewed-on: http://review.couchbase.org/44220
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>