[maven-release-plugin] prepare release maven-war-plugin-2.6

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1636977 13f79535-47bb-0310-9956-ffa450edef68
[maven-release-plugin] rollback the release of maven-war-plugin-2.6

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1636978 13f79535-47bb-0310-9956-ffa450edef68