CBLT-202: build scripts moved to release/ from extra/jenkins

Change-Id: I182c0da90781af657801624aeee188ba9a8a2757
Reviewed-on: http://review.couchbase.org/41321
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>