Changelog:
============
-Removed EntryPoint access by numeric index
-Added Distribution.origin supplying the direct_url.json in a SimpleNamespace.
-Added diagnose script.
-Added EntryPoints.__repr__
Signed-off-by: Wang Mingyu <wangmy@fujitsu.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>