[FIX] odoo-shippable: Change the pg_lo location to /var/log/pg_log
Change the pg_log from /var/lib/postgresql/*/main/pg_log/postgresql.log
to /var/log/pg_log
because the last one location is the default location of the log of postgres
Related with the follow comment https://github.com/Vauxoo/docker-ubuntu-base/pull/35#discussion_r146012037
This change depends of another pull request https://github.com/Vauxoo/maintainer-quality-tools/pull/249