Add 'ark backup logs' command for retrieval

Signed-off-by: Andy Goldstein <andy.goldstein@gmail.com>

examples/common/00-prereqs.yaml

@@ -72,6 +72,21 @@ spec:
     plural: configs
     kind: Config
 
+---
+apiVersion: apiextensions.k8s.io/v1beta1
+kind: CustomResourceDefinition
+metadata:
+  name: downloadrequests.ark.heptio.com
+  labels:
+    component: ark
+spec:
+  group: ark.heptio.com
+  version: v1
+  scope: Namespaced
+  names:
+    plural: downloadrequests
+    kind: DownloadRequest
+
 ---
 apiVersion: v1
 kind: Namespace