Worked around bug NMS-6784 by altering log messages from JMX invocations
inside Invoker and Starter.
Added core/spring-web project with classes that can be used to expose the
OpenNMS ServiceRegistry over Spring remoting. Fixed typo in Trapd context
that was preventing the system from starting up. Updated log4j2 to 2.0.2.
Fixed another test dependency problem in opennms-assemblies/http-remoting.