Convert GPL2License to use LicenseFamily constructor

git-svn-id: https://svn.apache.org/repos/asf/creadur/rat/branches/gsoc@1548694 13f79535-47bb-0310-9956-ffa450edef68
Convert GPL3License to use LicenseFamily constructor

git-svn-id: https://svn.apache.org/repos/asf/creadur/rat/branches/gsoc@1548696 13f79535-47bb-0310-9956-ffa450edef68