[requirements] adding pre-commit to requirements blacklist (skip check)

It seems that the list of linters from the the blacklist.txt file is a bit outdated and missing things like: pre-commit bashate ansilbe-lint ansible-review I discovered that while trying to enable pre-commit on tripleo-upgrades and discovered that check-requirements jobs was failing. If someone can help me merge that it would be great https://review.openstack.org/#/c/626000/ <https://review.openstack.org/#/c/626000/> My review contains only pre-commit because that was the one I really needed but looking at the file it seems it may be useful to add all known https://github.com/openstack/requirements/blob/master/blacklist.txt <https://github.com/openstack/requirements/blob/master/blacklist.txt> Thanks Sorin