This adds a role to upload log files to swift. It generates index
files, sets expiration times, and creates partitioned containers as
needed.
This is largely based on the zuul_swift_upload.py script written for
Zuul v2 by Joshua Hesketh.
Change-Id: If520c849fe6a20833804609583ea758e8dd2a6f6
Co-Authored-By: Joshua Hesketh <josh@nitrotech.org>
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