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

healthz instead of api endpoints.

cluster/rackspace/util.sh

@@ -311,7 +311,7 @@ kube-up() {
 
   #This will fail until apiserver salt is updated
   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