Set TCCL of all service and listener methods to defining CL

service.start() and service.stop() should execute with a TCCL of service.getClass().getClassLoader() [ defining CL ] instead of null. This will make it much easier for methods to use java APIs that do dynamic classloading and service loader style activities. For example, DocumentBuilderFactory.newInstance().

Listener invocations should also execute under their class loading context.