[MPIR-263] restored old java version detection algorithm and added IT to check the supported and not yet supported conditions

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1647791 13f79535-47bb-0310-9956-ffa450edef68
[MPIR-263] improved minimum java requirement when m-compiler-p not explicitely configured: use default properties

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1647803 13f79535-47bb-0310-9956-ffa450edef68