This patchset adds a support for Swift Global Cluster feature as
described at:
https://docs.openstack.org/swift/latest/overview_global_cluster.html
It allows specifying 'region' config option as part of the deployment.
Theregion is reflected later on in the Swift rings.
Change-Id: I11b6c7802e5bfbd61b06e4d11c65804a165781b6
Partial-Bug: 1815879
Needed-By: I406445493e2226aa5ae40a09c9053ac8633a46e9