HomeHandleImplIIOP not using the HandleDelegate

The class org.jboss.proxy.ejb.HomeHandleIIOPImpl is not using the HandleDelegate for serialization.

This is because the read/writeObject methods are public when they should be private to be invoked by
Serialization.

Since fixing this will change the serialization of the class (it will write the home stub to the stream instead of
currently writing the ior), we need a system property such that people can revert to the previous
serialization if it causes them problems.