[maven-release-plugin] prepare release syncope-1.1.6

git-svn-id: https://svn.apache.org/repos/asf/syncope/branches/1_1_X@1570852 13f79535-47bb-0310-9956-ffa450edef68
[maven-release-plugin] prepare for next development iteration

git-svn-id: https://svn.apache.org/repos/asf/syncope/branches/1_1_X@1570854 13f79535-47bb-0310-9956-ffa450edef68