[MDOAP-39]
 - Upgraded minimum Maven version to 2.2.1
 - removed limitations for IT's by invoker.properties based on
   Maven version.
 - Upgraded maven-plugin-api version from 2.0.6 to 2.2.1 in IT's.


git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1616950 13f79535-47bb-0310-9956-ffa450edef68