Fix Swift S3 API configuration
Fix Swift S3 API configuration

The endpoint must use the v3 suffix, otherwise authentication fails.

Closes-Bug: 1805660
Change-Id: I878abbeb9c0c2dc146692403b32002a4798f25f0

openstack/tripleo-heat-templates,dprince/tripleo-heat-templates,dprince/tripleo-heat-templates,openstack/tripleo-heat-templates