[MPMD-240] Migrate plugin to Maven 3.0

Housekeeping:

*   renaming package to o.a.m.plugin*s*.pmd
*   Rename the groupIds of the integration tests
    from o.a.m.plugin... to o.a.m.plugins...

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1813592 13f79535-47bb-0310-9956-ffa450edef68
84 files changed