External Resources not given creating ResourceManager

UIMA-2903 mentioned that External Resources, created by a Resource Manager, get instantiated with a different, unconnected, unique Resource Manager instance (returned by that Resource's getResourceManager() API), and suggests that it would be a better design to have the External Resource's getResourceManager() API return the ResourceManager that created it, instead.

This seems very reasonable to me. This Jira will change the implementation to do this.

It's possible that this may break code which was depending on having External Resource Creation being set up with an independent ResourceManager instance, but I doubt any code is depending on this.