CBLT-283:  fix up map from "branch" to "release"

Change-Id: Id566d2c9cbe014f5a0f79886d1476011099eec8f
Reviewed-on: http://review.couchbase.org/36844
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>