docs: def run_command(command):
      """
      Utility function for run command with subprocess. Return a tuple, with
      return code and if python >= 2.7 command's output or None if python <= 2.6
      """
      try:
          check_ouput = getattr(
              subprocess, 'check_output', subprocess.check_call)
          result = check_ouput(command, stderr=subprocess.STDOUT, shell=True)
          if check_ouput.__name__ == 'check_output':
              return 0, result
          else:
              return result, None
      except subprocess.CalledProcessError as e:
          return e.returncode, getattr(e, 'output', None)