UIMA-3964 JDs and JPs should not register ShutdownHook. UIMA-AS does this already.

git-svn-id: https://svn.apache.org/repos/asf/uima/sandbox/uima-ducc/trunk@1616494 13f79535-47bb-0310-9956-ffa450edef68
UIMA-3964 Added stop() to facilitate orderly shutdown of routes

git-svn-id: https://svn.apache.org/repos/asf/uima/sandbox/uima-ducc/trunk@1616495 13f79535-47bb-0310-9956-ffa450edef68