Update APIServer admission controllers. (#447)

The recommended set is sepecified here:

https://kubernetes.io/docs/admin/admission-controllers/#is-there-a-recommended-set-of-plug-ins-to-use

Fixes #438.

Author: diegs

pkg/asset/internal/templates.go

@@ -162,7 +162,7 @@ spec:
         - /var/lock/api-server.lock
         - /hyperkube
         - apiserver
-        - --admission-control=NamespaceLifecycle,LimitRanger,ServiceAccount,ResourceQuota
+        - --admission-control=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,ResourceQuota
         - --advertise-address=$(POD_IP)
         - --allow-privileged=true
         - --anonymous-auth=false
@@ -238,7 +238,7 @@ spec:
     - /var/lock/api-server.lock
     - /hyperkube
     - apiserver
-    - --admission-control=NamespaceLifecycle,ServiceAccount
+    - --admission-control=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,ResourceQuota
     - --allow-privileged=true
     - --authorization-mode=RBAC
     - --bind-address=0.0.0.0