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

[Eric Snow]

Eric Snow added the comment:

This patch implements most of Brett's recommendation.  I've held off on actually deprecating Finder just yet.  However, it would probably entail a message in the docs like this:

The API signatures for meta path finders and path entry finders
were separated by PEP 420.  This class is still available for
compatibility with legacy third party reimplementations of the import
system.  Either :class:`MetaPathFinder` or :class:`PathEntryFinder`
should be used instead.

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Added file: http://bugs.python.org/file26671/issue15502_invalidate_caches.diff

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