Adjustment on setup.py to install addons when using setuptools install.

After running
```
python setup.py install
```

The installed version of odoo (in pythonpath site-packages) does not contain the full list of addons shown here: https://github.com/odoo/odoo/tree/master/addons

This prevents any install from using the full list of addons (unless you manually start specifiying an addons path via config or command line argument)