MB-11411:  same revisions as 2.5.1 release, ep-engine uses branch "MB-11411"

Change-Id: Id7b918dc9ac4e0d6396ed4e61e96a3bdbb2d3096
Reviewed-on: http://review.couchbase.org/38186
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>