Patch to add debugging capability for the main test karaf container when building itests

Another Patch that I thought would be useful for you guys. The attached patch let's you add a system property, -DdebugMain (Not really a brilliantly named property), which will turn on the debug option in the main karaf test container, since the surefire debug won't work for it. This makes it convenient to turn on debugging leveraging the karaf debug integration testing option that it provides.