[MPOM-49] configure plugin-tools with phase override instead of twice-descriptor execution

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1601067 13f79535-47bb-0310-9956-ffa450edef68
updated parent pom

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1601068 13f79535-47bb-0310-9956-ffa450edef68