try-resource refactoring

git-svn-id: https://svn.apache.org/repos/asf/jena/trunk@1614482 13f79535-47bb-0310-9956-ffa450edef68
try-resource cleaning

git-svn-id: https://svn.apache.org/repos/asf/jena/trunk@1614485 13f79535-47bb-0310-9956-ffa450edef68