[cern] fix for k8s admission control list

Support for Kubernetes admission control list was added in commit 0eb96907, but we missed the update of the heat params .sh file in the master.

The .sh file only exists at CERN (not upstream), so the cherry-pick wasn't enough.

magnum/drivers/common/templates/kubernetes/fragments/write-heat-params-master.sh

@@ -18,6 +18,7 @@ FLANNEL_NETWORK_CIDR="$FLANNEL_NETWORK_CIDR"
 FLANNEL_NETWORK_SUBNETLEN="$FLANNEL_NETWORK_SUBNETLEN"
 FLANNEL_BACKEND="$FLANNEL_BACKEND"
 PORTAL_NETWORK_CIDR="$PORTAL_NETWORK_CIDR"
+ADMISSION_CONTROL_LIST="$ADMISSION_CONTROL_LIST"
 ETCD_DISCOVERY_URL="$ETCD_DISCOVERY_URL"
 USERNAME="$USERNAME"
 PASSWORD="$PASSWORD"