Setup region-name for tripleo-test-cloud-rh1

This is in prep work for launching a tripleo AFS mirror. We use the
region name part of the DNS address of the server and for our
configure_mirror.sh ready script.

Change-Id: Iddb8a00ee9839cb283095c90cce3745f128983d7
Depends-On: Id9765e60dc7b881c7086d242a4d0bf4885f8bb59
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

nodepool/nodepool.yaml

@@ -656,6 +656,7 @@ providers:
         private-key: /home/nodepool/.ssh/id_rsa
         config-drive: true
   - name: tripleo-test-cloud-rh1
+    region-name: 'nova'
     cloud: tripleo-test-cloud-rh1
     boot-timeout: 120
     max-servers: 54