[maven-release-plugin] prepare release 2.0.0-beta

git-svn-id: https://svn.apache.org/repos/asf/santuario/xml-security-java/trunk@1534671 13f79535-47bb-0310-9956-ffa450edef68
[maven-release-plugin] prepare for next development iteration

git-svn-id: https://svn.apache.org/repos/asf/santuario/xml-security-java/trunk@1534673 13f79535-47bb-0310-9956-ffa450edef68