Updates relating to PEP 426 specifications for exports and commands.

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rename : tests/fake_dists/babar-0.1.dist-info/EXPORTS => tests/fake_dists/babar-0.1.dist-info/pydist-exports.json
rename : tests/fake_dists/choxie-2.0.0.9.dist-info/EXPORTS => tests/fake_dists/choxie-2.0.0.9.dist-info/pydist-exports.json
rename : tests/fake_dists/towel_stuff-0.1.dist-info/EXPORTS => tests/fake_dists/towel_stuff-0.1.dist-info/pydist-exports.json