JENA-682 : Update to Apache Parent POM v14

git-svn-id: https://svn.apache.org/repos/asf/jena/trunk@1588645 13f79535-47bb-0310-9956-ffa450edef68
Remove unused import

git-svn-id: https://svn.apache.org/repos/asf/jena/trunk@1588646 13f79535-47bb-0310-9956-ffa450edef68
Remove warning (no @Override on interface method)

git-svn-id: https://svn.apache.org/repos/asf/jena/trunk@1588647 13f79535-47bb-0310-9956-ffa450edef68