Use wljmxclient.jar instead of weblogic.jar in the searchpath of the WebLogic JMX client

The WebLogicJMXLibClassLoader currently loads classes from weblogic.jar instead of using the documented. This was done during resolution of ARQ-725 to avoid initialization of a Java SecurityManager, but this is a bad idea in retrospect considering that the use of weblogic.jar may be unsupported and that internal details of WebLogic Server may change in the future.

Therefore, the default search path for the WebLogicJMXLibClassLoader would be changed from weblogic.jar to wljmxclient.jar.