[maven-release-plugin] prepare release shiro-root-1.2.3

git-svn-id: https://svn.apache.org/repos/asf/shiro/branches/1.2.x@1571855 13f79535-47bb-0310-9956-ffa450edef68
[maven-release-plugin] prepare for next development iteration

git-svn-id: https://svn.apache.org/repos/asf/shiro/branches/1.2.x@1571857 13f79535-47bb-0310-9956-ffa450edef68