ensure-kubernetes: workaround slow account creation

Per the referenced link, account creation can be slow and that's just
the way it is.  This should help tests that fail with

  Error from server (Forbidden): error when creating "test-pod.yaml":
  pods "test" is forbidden: error looking up service account
  default/default: serviceaccount "default" not found

Change-Id: I405aa7e58737c7061a471da2e2807c77756c76b8

test-playbooks/ensure-kubernetes/crio.yaml

@@ -13,6 +13,15 @@
       become: yes
       failed_when: false
 
+    # The default account is known to take a while to appear; see
+    #  https://github.com/kubernetes/kubernetes/issues/66689
+    - name: Ensure default account created
+      command: kubectl -n default get serviceaccount default -o name
+      retries: 5
+      delay: 5
+      register: result
+      until: result.rc == 0
+
     - name: Create a test pod definition
       copy:
         dest: test-pod.yaml