sphinx: fixed build error while `pip install sphinxjp.themecore ...`
sphinx: fixed build error while `pip install sphinxjp.themecore ...`

```
+ pip install sphinxjp.themecore sphinxjp.themes.sphinxjp sphinx_rtd_theme
Collecting sphinxjp.themecore
  Downloading sphinxjp.themecore-0.2.0.tar.gz
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
    ImportError: No module named setuptools

    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-mMoOEL/sphinxjp.themecore
```

minimum2scp/dockerfiles,minimum2scp/dockerfiles,minimum2scp/dockerfiles