Support passing kube-scheduler policy config

cluster/gce/gci/configure-helper.sh

@@ -992,6 +992,14 @@ current-context: kube-scheduler
 EOF
 }
 
+function create-kubescheduler-policy-config {
+  echo "Creating kube-scheduler policy config file"
+  mkdir -p /etc/srv/kubernetes/kube-scheduler
+  cat <<EOF >/etc/srv/kubernetes/kube-scheduler/policy-config
+${SCHEDULER_POLICY_CONFIG}
+EOF
+}
+
 function create-node-problem-detector-kubeconfig {
   echo "Creating node-problem-detector kubeconfig file"
   mkdir -p /var/lib/node-problem-detector
@@ -1880,6 +1888,11 @@ function start-kube-scheduler {
   if [[ -n "${SCHEDULING_ALGORITHM_PROVIDER:-}"  ]]; then
     params+=" --algorithm-provider=${SCHEDULING_ALGORITHM_PROVIDER}"
   fi
+  if [[ -n "${SCHEDULER_POLICY_CONFIG:-}" ]]; then
+    create-kubescheduler-policy-config
+    params+=" --use-legacy-policy-config"
+    params+=" --policy-config-file=/etc/srv/kubernetes/kube-scheduler/policy-config"
+  fi
   local -r kube_scheduler_docker_tag=$(cat "${KUBE_HOME}/kube-docker-files/kube-scheduler.docker_tag")
 
   # Remove salt comments and replace variables with values.