title: KubernetesPodOperator not recognizing the service_account_name
body: <p>I created a <code>serviceAccount</code> resource named <code>my-app-cluster-access</code>. Then supply that resource name in the <code>service_account_name</code> argument in the <code>KubernetesPodOperator</code>. But I keep getting the error </p>
  
  <pre><code>HTTP response body: {"kind":"Status","apiVersion":"v1","metadata":{},"status":"Failure","message":"pods is forbidden: User \"system:serviceaccount:my-release-name:default\" cannot create resource \"pods\" in API group \"\" in the namespace \"default\"","reason":"Forbidden","details":{"kind":"pods"},"code":403}
  </code></pre>
  
  <p>The message seem to indicate that the supplied value of the <code>service_account_name</code> is not being applied since the message still has the <code>default</code> text. I check the <code>KubernetesPodOperator</code> source code and look likes the mapping is there. </p>
  
  <p>Before I created <code>ServiceAccount</code> resource, I also got that same error message. Do I need to create a <code>ServiceAccount</code> resource to use that operator? I need to be able to use <code>KubernetesPodOperator</code> and so far is not working after adding the <code>ServiceAccount</code>. I already set the <code>in_cluster</code> arg to <code>True</code>.</p>