Updating /cluster to use v1beta 3 specs, and change a lot of polling to

healthz instead of api endpoints.

cluster/azure/util.sh

@@ -398,7 +398,7 @@ function kube-up {
     echo
 
     until curl --insecure --user "${KUBE_USER}:${KUBE_PASSWORD}" --max-time 5 \
-        --fail --output /dev/null --silent "https://${KUBE_MASTER_IP}/api/v1beta1/pods"; do
+        --fail --output /dev/null --silent "https://${KUBE_MASTER_IP}/healthz"; do
         printf "."
         sleep 2
     done