Add DFW3 to raxflex cloud profiles on bridge

There is a new DFW3 cloud region that we can use in raxflex. This
updates the two existingraxflex cloud profiles to add the DFW3 profile.
Note that we must the the keystone for each corresponding region so we
do some hacks that other cloud profiles like those for open telekom
cloud and citycloud do within the openstacksdk built in profiles.
Basically we template the region_name into the auth url.

Change-Id: I69ee0c8f4a92cfc100a4e7927a57af933cc287e9

playbooks/templates/clouds/bridge_all_clouds.yaml.j2

@@ -73,8 +73,9 @@ clouds:
   opendevci-raxflex:
     regions:
       - name: SJC3
+      - name: DFW3
     auth:
-      auth_url: 'https://keystone.api.sjc3.rackspacecloud.com/v3'
+      auth_url: 'https://keystone.api.{region_name}.rackspacecloud.com/v3'
       project_id: '{{ clouds.opendevci_raxflex_project_id }}'
       username: '{{ clouds.opendevci_raxflex_username }}'
       password: '{{ clouds.opendevci_raxflex_key }}'
@@ -82,8 +83,9 @@ clouds:
   opendevzuul-raxflex:
     regions:
       - name: SJC3
+      - name: DFW3
     auth:
-      auth_url: 'https://keystone.api.sjc3.rackspacecloud.com/v3'
+      auth_url: 'https://keystone.api.{region_name}.rackspacecloud.com/v3'
       project_id: '{{ clouds.opendevzuul_raxflex_project_id }}'
       username: '{{ clouds.opendevzuul_raxflex_username }}'
       password: '{{ clouds.opendevzuul_raxflex_key }}'