CBD-1383:  rel-2.5.1 couchdb uses branch "MB-11187"

Change-Id: I0bfbe194e274e2c6af09641c1d4ca635f2597602
Reviewed-on: http://review.couchbase.org/37663
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>