Bug 1772

The coupling of the lifetime of an Object (TAO_Stub to be precise) with that 
of the ORB Core leads to all sort of problems. An ORB Core cannot die until 
all object references it created are dead.  If the interceptor implementation 
has an object reference and the interceptors are destroyed when the ORB Core is
destroyed, then we have a circular lifetime dependency: the ORB Core will not 
be destroyed because of an outstanding object reference and the object 
reference will not be destroyed because the interceptors have not been 
destroyed until the ORB Core is destroyed.

A solution is to decouple the lifetime of the Object from the lifetime
of the ORB Core.  The Object may still need to access allocators and
such resources to cleanup gracefully after the ORB has been shutdown,
but it does not make sense for the Object to hold the ORB lifetime
hostage until it goes away itself.  One approach would be to reference
count these resources by themself.  Another would be to delete all ORB
Core resources in ORB::destroy() except for the few that maybe needed
by the Object.