Move Drools correlation stuff in etc/examples into the new drools-engine.d
directory structure, and wire in and use a better way to do logging.

Squashed commit of the following:

commit 63d4c32c161fb61dc88c8ca5281afe7046018644
Merge: 14a71a3 bc77ff6
Author: Jeff Gehlbach <jeffg@opennms.org>
Date:   Fri Jan 31 10:34:49 2014 -0500

    Merge branch '1.12' of github.com:OpenNMS/opennms into feature-drools-logging-examples

commit 14a71a3384129f6d10f60abb9f41cfd16ed6c0e4
Author: Jeff Gehlbach <jeffg@opennms.org>
Date:   Fri Jan 31 10:01:52 2014 -0500

    Update nodeParentRules to new layout and to use SLF4J Logger

commit 18aebdf0b70e7749568e3577addab301507f09e9
Author: Jeff Gehlbach <jeffg@opennms.org>
Date:   Fri Jan 31 09:42:55 2014 -0500

    Move Drools config into drools-engine.d structure