[CI] py34: Document object is not iterable

When running Murano CI tests, python setup.py egg_info fails.

Traceback (most recent call last):
       File "<string>", line 1, in <module>
       File "/tmp/pip-build-VJZyeQ/rcssmin/setup.py", line 42, in <module>
         setup()
       File "/tmp/pip-build-VJZyeQ/rcssmin/setup.py", line 33, in setup
         return run(script_args=args, ext=ext, manifest_only=_manifest)
       File "_setup/py2/setup.py", line 421, in run
         return _core.setup(**kwargs)
       File "/usr/lib/python2.7/distutils/core.py", line 151, in setup
         dist.run_commands()
       File "/usr/lib/python2.7/distutils/dist.py", line 953, in run_commands
         self.run_command(cmd)
       File "/usr/lib/python2.7/distutils/dist.py", line 972, in run_command
         cmd_obj.run()
       File "/usr/local/lib/python2.7/dist-packages/setuptools/command/egg_info.py", line 279, in run
         self.find_sources()
       File "/usr/local/lib/python2.7/dist-packages/setuptools/command/egg_info.py", line 306, in find_sources
         mm.run()
       File "/usr/local/lib/python2.7/dist-packages/setuptools/command/egg_info.py", line 533, in run
         self.add_defaults()
       File "/usr/local/lib/python2.7/dist-packages/setuptools/command/egg_info.py", line 562, in add_defaults
         sdist.add_defaults(self)
       File "/usr/local/lib/python2.7/dist-packages/setuptools/command/py36compat.py", line 35, in add_defaults
         self._add_defaults_data_files()
       File "/usr/local/lib/python2.7/dist-packages/setuptools/command/py36compat.py", line 111, in _add_defaults_data_files
         dirname, filenames = item
     TypeError: 'Documentation' object is not iterable