Revision 421620

Fixed a bug in filtering services based on package wirings. If the service
provider did not import the package containing the service interface (e.g.,
perhaps the interface was implemented by an imported superclass), then
filtering would fail because it was only trying to load the class from
the bundle that registered the service object, but it did not have access
to it. Modified the algorithm to use a more exhaustive approach to determine
where the class comes from in such scenarios.