[Merge] ~chris.macnaughton/ubuntu/+source/python-keystonemiddleware:master into ~ubuntu-server-dev/ubuntu/+source/python-keystonemiddleware:master

[Corey Bryant]

Review: Approve

Thanks. Merged and uploaded. I switched the other occurrences of python_distutils to pybuild as well in debian/rules.
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https://code.launchpad.net/~chris.macnaughton/ubuntu/+source/python-keystonemiddleware/+git/python-keystonemiddleware/+merge/388734
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