Fix rbac rules (deckhouse#69)

We need to watch/list namespaces/service-accounts either

Author: yalosev

helm/charts/k8s-image-availability-exporter/templates/rbac.yaml

@@ -12,12 +12,22 @@ rules:
       - list
       - watch
       - get
+  - apiGroups:
+      - ""
+    resources:
+      - namespaces
+    verbs:
+      - list
+      - watch
+      - get
   - apiGroups:
       - ""
     resources:
       - serviceaccounts
     verbs:
       - get
+      - list
+      - watch
   - apiGroups:
       - extensions
       - apps