[issue15502] Meta path finders and path entry finders are different, but share an ABC

[Nick Coghlan]

Nick Coghlan added the comment:

In reviewing Eric's changes, I found what I consider a good reason to keep Finder as the root of the hierarchy: *all* finders, both meta path and path entry, will continue to share the optional "invalidate_caches" API.

I'll commit a variant that has the inheritance that way around (still narrowing the "find_module" API for the new ABCs) and see how it looks to everyone.

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<http://bugs.python.org/issue15502>
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