Cleanup yang tools error messages at startup

When the controller is starting up, it prints a lot of error messages like this:

2014-01-26 02:00:29.068 PST [Start Level Event Dispatcher] ERROR o.o.y.s.b.g.i.LazyGeneratedCodecRegistry - YANGTools Bug: SchemaNode for org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.multipart.request.multipart.request.body.MultipartRequestQueueCase, with path SchemaPath [path=[(urn:opendaylight:openflow:protocol?revision=2013-07-31)multipart-request, (urn:opendaylight:openflow:protocol?revision=2013-07-31)multipart-request-body, (urn:opendaylight:openflow:protocol?revision=2013-07-31)multipart-request-queue-case], absolute=true] was not found in context.

This needs to be cleaned up, since this is not a fatal condition and the system can recover from it. At the very minimum, it should not be reported as a bug, since that will create a lof of user confusion.