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

Change-Id: I2ea74a4762bae47d909de629bb3e3001693fd3a5
Reviewed-on: http://review.couchbase.org/37662
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>
Reviewed-by: Chris Hillery <ceej@couchbase.com>
Tested-by: Chris Hillery <ceej@couchbase.com>