ch3/etcd-operator-deployment: Update Deployment api loc for k8s 1.16+

K8s 1.16+ stops serving the deprecated versions of the Deployment at the older APIs and rejects calls to API < apps/v1.
See: https://kubernetes.io/blog/2019/07/18/api-deprecations-in-1-16/
This changeset adapted from coreos/etcd-operator#2127

ch03/etcd-operator-deployment.yaml

@@ -1,35 +1,28 @@
-apiVersion: extensions/v1beta1
+apiVersion: apps/v1
 kind: Deployment
 metadata:
-  labels:
-    name: etcdoperator
   name: etcd-operator
 spec:
-  replicas: 1
   selector:
     matchLabels:
-      name: etcd-operator
+      app: etcd-operator
+  replicas: 1
   template:
     metadata:
       labels:
-        name: etcd-operator
+        app: etcd-operator
     spec:
       containers:
       - name: etcd-operator
         image: quay.io/coreos/etcd-operator:v0.9.4
         command:
         - etcd-operator
-        - --create-crd=false
         env:
         - name: MY_POD_NAMESPACE
           valueFrom:
             fieldRef:
-              apiVersion: v1
               fieldPath: metadata.namespace
         - name: MY_POD_NAME
           valueFrom:
             fieldRef:
-              apiVersion: v1
               fieldPath: metadata.name
-        imagePullPolicy: IfNotPresent
-      serviceAccountName: etcd-operator-sa