[FIX] packaging: include _vendor in packaging

Since a0f9ef56, a _vendor module was added without `__init__.py` file,
following the PEP 420 specifications.

Unfortunately, as the `setuptools.find_packages()` only recognize
packages if they have such an init file, the _vendor module is not
packaged. This leads to an import error when running Odoo from the
src,deb and rpm packages.

The `setuptools.find_namespace_packages()`, which is compliant with PEP
420, could have been used instead. But this function does not exists in
setuptools 39.0.1 which is the one packaged in Ubuntu Bionic.

Finally, this commit simply adds the missing dunder init file.

closes odoo/odoo#50051

Signed-off-by: Christophe Monniez (moc) <moc@odoo.com>

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