[TA36] add a swift only recipe to only set up haproxy for keystone and swift

- this recipe is desgined to be used only by a node as part of the
ha-swift-controller# role. The expectation is that you're setting up a node
running mysql, keystone, and swift management/proxy services
partially addresses TA36

- also, sort server list before creating config file so order is always
the same
closes DE52
closes https://github.com/rcbops/chef-cookbooks/issues/341