[cern] Trivial fix for cluster creation in master

cherry-pick https://review.opendev.org/#/c/679987/

This is the fix for the "line 528: KUBE_PROXY_ARGS: unbound variable" error in master.

Change-Id: Iaf5bbc8e4946c6625e82b6f68e754328f08b6ce7 Story: 2006492 Task: 36448

OS-9823

magnum/drivers/common/templates/kubernetes/fragments/configure-kubernetes-master.sh

@@ -50,8 +50,8 @@ CERT_DIR=/etc/kubernetes/certs
 
 # kube-proxy config
 PROXY_KUBECONFIG=/etc/kubernetes/proxy-kubeconfig.yaml
-cat > /etc/kubernetes/proxy << EOF
 KUBE_PROXY_ARGS="--kubeconfig=${PROXY_KUBECONFIG} --cluster-cidr=${PODS_NETWORK_CIDR}"
+cat > /etc/kubernetes/proxy << EOF
 KUBE_PROXY_ARGS="${KUBE_PROXY_ARGS} ${KUBEPROXY_OPTIONS}"
 EOF