by auto-extending addons path with odoo.addons.__path__.
This patch also introduce
* an explicit declaration of odoo.addons as a namespace package
This is necessary because the standard way of declaring namespace
packages in setup.py does not work as long as odoo/__init__.py
contains code.
* a more reliable way to find odoo root path.
The use of an entry point was considered in order to provide
an `odoo` command in the path for the packages users, but the
generated entry point will first check that all the things in
install_requires were provided in a not bright way: it'll check
that it matches a distribution name. This does not work because
python-chart does not have the distrubtion name "pychart" which
is provided by the python-pychart package in debian jessie. Same
for suds-jurko which is provided by python-suds in debian stretch
but does not have the distribution name "suds".
Also, adapted the packages tests to these cli changes.
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