Updated openstack/openstack
Project: openstack/python-heatclient  a49e7f1eaa628083af819e4d7c2f396da32fc5dd
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Sort requirement files in alphabetical order

This makes code more readable, and can check whether specific library
in the requirement files easily. We also enforce the check in pep8.

Change-Id: I08434dd56d41a82045e4119e547b7b3f60d66698
Closes-Bug: #1285478