The swift operations were rebuilding the swift client with every
operation. This is very expensive, calls over to keystone often and is
generally very slow.
This change supports building a swift service that is used across many
operations. This should speed up operations quite a bit, especially
with a reboot of the system.
Change-Id: Iacbc87f26cf2e568bc662a96b6d9b459b814c98f
Partial-Bug: 1584946