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.

Avoids starting to create files that are not cleaned up.