Decompose Swift Roles From puppet-openstack

The current data model still uses puppet-openstack for Swift support (this is largely evolutionary: puppet_openstack_builder has eliminated the use of puppet-openstack for pretty much everything else since it's inception but hasn't yet completed the decomposition of swift). This is problematic on a number of fronts: puppet-openstack is slowly being deprecated and it's Swift settings have been known to cause resource conflicts and race conditions in some scenarios. We should finally remove puppet-openstack completely by making puppet_openstack_builder use the underlying puppet-swift classes directly instead of relying on puppet-openstack as a middle layer.

The i.0 release would be a good time to do this in case there are any accompanying end-user-exposed changes in user.common.yaml or the like.