releng: plugins update

git-svn-id: https://svn.apache.org/repos/asf/oltu/trunk@1564061 13f79535-47bb-0310-9956-ffa450edef68
[maven-release-plugin] prepare release org.apache.oltu.parent-2

git-svn-id: https://svn.apache.org/repos/asf/oltu/trunk@1564062 13f79535-47bb-0310-9956-ffa450edef68