QPID-5702: upgrade JUnit dependency from version 3.8.1 to 4.11, change imports etc to remove deprecation notices

Patch Supplied by Andrew MacBean <andymacbean@gmail.com>.

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1589144 13f79535-47bb-0310-9956-ffa450edef68