Remove package_data and data_files options from setup.py

[wiggin15]

With include_package_data option set to True in setup.py, package data that is specified in MANIFEST.in is installed into the target directory when installing selenium. This means that we don't need to specify package_data and data_files in setup.py too. With the options set as before, files were included twice in wheel distributions (once in their original place and once in the ".data" directory) and that triggered a bug that caused setuptools to fail to install the wheel distribution of selenium.

I verified that running python setup.py bdist_wheel and python setup.py sdist create distributions with the data files inside and that the data files are installed when installing the created distributions.

Fixes issue #5907

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[davehunt]

This looks okay, and makes sense. I'm concerned that there may have been a reason for including these keys in setup.py, but it's not one that I recall. The tests mostly pass for me locally, and I'm not convinced the failures are related to this change. Unfortunately there's an issue preventing the tests from running on Travis CI, which #5990 may assist with.

[lmtierney]

Ok, I've finally had time to try this on a Windows machine and it looks like it's fine. We'll get it into the next release and if it produces problems we'll be able to immediately do a point release.

[lmtierney]

Thank you for your contribution!