[maven-release-plugin] prepare release 2.2.2

git-svn-id: https://svn.apache.org/repos/asf/openjpa/branches/2.2.x@1466989 13f79535-47bb-0310-9956-ffa450edef68
[maven-release-plugin] prepare for next development iteration

git-svn-id: https://svn.apache.org/repos/asf/openjpa/branches/2.2.x@1466991 13f79535-47bb-0310-9956-ffa450edef68