Update etcd from v3.4.1 to v3.4.2

* https://github.com/etcd-io/etcd/releases/tag/v3.4.2

azure/container-linux/kubernetes/cl/controller.yaml.tmpl

@@ -7,7 +7,7 @@ systemd:
         - name: 40-etcd-cluster.conf
           contents: |
             [Service]
-            Environment="ETCD_IMAGE_TAG=v3.4.1"
+            Environment="ETCD_IMAGE_TAG=v3.4.2"
             Environment="ETCD_NAME=${etcd_name}"
             Environment="ETCD_ADVERTISE_CLIENT_URLS=https://${etcd_domain}:2379"
             Environment="ETCD_INITIAL_ADVERTISE_PEER_URLS=https://${etcd_domain}:2380"