Extract version with setuptools-scm

In the case of a database not started by the script, some information was missing.

 Fix path used when running chown in the image, it was using /var/lib/odoo which is not where the data is present when running

Also fix some reST

Marabunta is not run when using do_tests.
Change how the tests are run with do_tests: modules not to be tested are installed, then modules to test are installed with test enabled. This fix the issues of installation tests that were not run previously.