Python 3 doesn't like this:

    ======================================================================
    ERROR: test_001 (__main__.TestNmcli)
    ----------------------------------------------------------------------
    Traceback (most recent call last):
      File "./clients/tests/test-client.py", line 785, in f
        self._nm_test_post()
      File "./clients/tests/test-client.py", line 767, in _nm_test_post
        content_new = ''.join([r['content'] for r in results])
    TypeError: sequence item 0: expected str instance, bytes found