distutils-r1.eclass: make *_install_for_testing install proper egg-info
Currently distutils_install_for_testing does not install the complete
egg-info into ${TEST_DIR}. This was first noticed by W. Trevor King
and reported in bug #524322. Based on info found in the related upstream
setuptools bug I added the necessary call to setuptools to create
the complete egg_info.
Without this certain packages (like cryptography) fail during testing
because they use introspection but the metadata isn't available.
Bug: https://bugs.gentoo.org/524322
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