Update CRD source doc with RBAC, fix CRD manifest

* Add RBAC piece of documentation

* Remove `status:` to avoid validation failure

Otherwise it fails with
```
$ kubectl apply -f crd-manifest.yaml
error: error validating "crd-manifest.yaml": error validating data: ValidationError(CustomResourceDefinition.status): missing required field "storedVersions" in io.k8s.apiextensions-apiserver.pkg.apis.apiextensions.v1beta1.CustomResourceDefinitionStatus;
```

docs/contributing/crd-source.md

@@ -106,3 +106,15 @@ INFO[0000] Connected to cluster at https://192.168.99.100:8443
 INFO[0000] CREATE: foo.bar.com 180 IN A 192.168.99.216
 INFO[0000] CREATE: foo.bar.com 0 IN TXT "heritage=external-dns,external-dns/owner=default"
 ```
+
+### RBAC configuration
+
+If you use RBAC, extend the `external-dns` ClusterRole with:
+```
+- apiGroups: ["externaldns.k8s.io"]
+  resources: ["dnsendpoints"]
+  verbs: ["get","watch","list"]
+- apiGroups: ["externaldns.k8s.io"]
+  resources: ["dnsendpoints/status"]
+  verbs: ["*"]
+```

docs/contributing/crd-source/crd-manifest.yaml

@@ -60,8 +60,3 @@ spec:
               type: integer
           type: object
   version: v1alpha1
-status:
-  acceptedNames:
-    kind: ""
-    plural: ""
-  conditions: null