Updated openstack/openstack
Project: openstack/swift  429445d97b292aad63b8ffec6e47555b7cabd0d0
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Only run flake8 on Swift code

In particular, this skips the "build" directory, which is prone to
containing third-party stuff that doesn't comply with all the various
hacking/flake8/pep8 checks.

Change-Id: Ibe2240d8c6ca5947b2cac259cd7d0a1154f8a9cd