[maven-release-plugin] prepare release archiva-2.0.0-RC2

git-svn-id: https://svn.apache.org/repos/asf/archiva/branches/2.0.0-RC@1563735 13f79535-47bb-0310-9956-ffa450edef68
[maven-release-plugin] prepare for next development iteration

git-svn-id: https://svn.apache.org/repos/asf/archiva/branches/2.0.0-RC@1563737 13f79535-47bb-0310-9956-ffa450edef68