This came to light because someone ran Tempest against a standard
installation of RDO, which helpfuly terminates SSL for Swift in
a pre-configured load-balancer. In such a case, staticweb has no
way to know what scheme to use and guesses wrong, causing Tempest
to fail.
Related upstream bug:
https://bugs.launchpad.net/mos/+bug/1537071
Change-Id: Ie15cf2aff4f7e6bcf68b67ae733c77bb9353587a
Closes-Bug: 1572011