fix webhook manifests (#866)

the current manifest is not align with doc and example,
update this and later patch will update doc accordingly.

Author: jichenjc

manifests/webhook/k8s-keystone-auth-ds.yaml

@@ -16,6 +16,7 @@ spec:
       labels:
         k8s-app: k8s-keystone-auth
     spec:
+      serviceAccountName: k8s-keystone
       hostNetwork: true
       nodeSelector:
         node-role.kubernetes.io/master: ""
@@ -35,8 +36,8 @@ spec:
             - /etc/kubernetes/pki/apiserver.crt
             - --tls-private-key-file
             - /etc/kubernetes/pki/apiserver.key
-            - --keystone-policy-file
-            - /etc/kubernetes/webhook/policy.json
+            - --policy-configmap-name
+            - k8s-auth-policy
             - --keystone-url=http://ctl:5000/v3
           volumeMounts:
             - mountPath: /etc/kubernetes/pki

manifests/webhook/k8s-keystone-auth-pod.yaml

@@ -9,6 +9,7 @@ metadata:
   name: k8s-keystone-auth
   namespace: kube-system
 spec:
+  serviceAccountName: k8s-keystone
   containers:
     - name: k8s-keystone-auth
       image: docker.io/k8scloudprovider/k8s-keystone-auth:latest
@@ -19,8 +20,8 @@ spec:
         - /etc/kubernetes/pki/apiserver.crt
         - --tls-private-key-file
         - /etc/kubernetes/pki/apiserver.key
-        - --keystone-policy-file
-        - /etc/kubernetes/webhook/policy.json
+        - --policy-configmap-name
+        - k8s-auth-policy
         - --keystone-url=http://ctl:5000/v3
       volumeMounts:
         - mountPath: /etc/kubernetes/pki