Update webhook configuration to listen on 9443 rather than 443

This enables running the operator in clusters that don't allow pods to
bind ports below 1024 (like OpenShift with SCC on).

config/default/manager_webhook_patch.yaml

@@ -9,7 +9,7 @@ spec:
       containers:
       - name: manager
         ports:
-        - containerPort: 443
+        - containerPort: 9443
           name: webhook-server
           protocol: TCP
         - containerPort: 8081

config/webhook/service.yaml

@@ -6,7 +6,7 @@ metadata:
   namespace: system
 spec:
   ports:
-    - port: 443
-      targetPort: 443
+    - port: 9443
+      targetPort: 9443
   selector:
     control-plane: controller-manager

main.go

@@ -112,6 +112,7 @@ func main() {
 		MetricsBindAddress:   metricsAddr,
 		LeaderElection:       enableLeaderElection,
 		LivenessEndpointName: "/healthz",
+		Port:                 9443,
 	})
 
 	if err != nil {