OPENJPA-2368: Undo revert on 2.2.x (Move www.apache.org/openjpa/ns/orm to openjpa.apache.org/ns/orm)

git-svn-id: https://svn.apache.org/repos/asf/openjpa/branches/2.2.x@1594006 13f79535-47bb-0310-9956-ffa450edef68