Fix not-ready master node after upgrade.

cluster/gce/upgrade.sh

@@ -74,6 +74,7 @@ function upgrade-master() {
   get-kubeconfig-bearertoken
 
   detect-master
+  parse-master-env
 
   # Delete the master instance. Note that the master-pd is created
   # with auto-delete=no, so it should not be deleted.
@@ -120,7 +121,6 @@ function prepare-upgrade() {
   tars_from_version
 }
 
-
 # Reads kube-env metadata from first node in NODE_NAMES.
 #
 # Assumed vars:
@@ -134,15 +134,6 @@ function get-node-env() {
       'http://metadata/computeMetadata/v1/instance/attributes/kube-env'" 2>/dev/null
 }
 
-# Using provided node env, extracts value from provided key.
-#
-# Args:
-# $1 node env (kube-env of node; result of calling get-node-env)
-# $2 env key to use
-function get-env-val() {
-  echo "${1}" | grep ${2} | cut -d : -f 2 | cut -d \' -f 2
-}
-
 # Assumed vars:
 #   KUBE_VERSION
 #   NODE_SCOPES