Make util.run py3 compatible. (#281)
Make util.run py3 compatible. (#281)

* It looks like on python3 util.run keeps polling for the end of stdout
  becase we don't treat the final line as a byte string e.g b''.

* Need to decode some strings in python3.
kubeflow/testing,kubeflow/testing,kubeflow/testing,kubeflow/testing,kubeflow/testing