test on pylint should use the PR level to be more strict

OCA Pylint have different configuration
https://github.com/OCA/maintainer-quality-tools/tree/master/travis/cfg

We should use the PR version which is more strict (more test applied)

I have try localy to use the travis_run_pylint_pr.cfg but it's seem that it's not working.

@bguillot can you have a look on that?

Tks
