[maven-release-plugin] prepare branch 1_2_X

git-svn-id: https://svn.apache.org/repos/asf/syncope/trunk@1608351 13f79535-47bb-0310-9956-ffa450edef68
[maven-release-plugin] prepare for next development iteration

git-svn-id: https://svn.apache.org/repos/asf/syncope/trunk@1608353 13f79535-47bb-0310-9956-ffa450edef68