ensure an endpoint destination which is still in use won't be shutdown inproperly

This could happen when two endpoints share the same address. Though the second endpoint won't get started because "endpoint already registered on address", but the second endpoint could shutdown the destination which is still used by the first endpoint.
More background can be found in this discussion
http://cxf.547215.n5.nabble.com/CXF-endpoint-unexpectedly-unregistered-td5807854.html