pre-commit is not fully running on triple-ansible

[Sorin Sbarnea]

Despite the fact that openstack/tripleo-ansible repository has a pre-commit config, the CI job is not fully running it, missing to spot various errors.

If a user runs it locally on all files, it will fail as we have already merged files that are not conformant.

By looking deeper on how openstack-tox-linters job is running I discovered that this repository tox configuration is extremely complex for no good reasons.

We need to address this and assure that `tox -e linters` runs and tests all files on both Zuul and also on developer machines.

For example, I saw tox environments created for some random pre-commit hooks but not for others and I see no real need to create a never ending suite of tox environments for each check, fix or linter that we may use at one point, that is non-maintainable.

By default, it should run all linters, with auto-fixers first and slow one at bottom. Also, tox can pass name of the nook as optional parameter which would allow users to run a single hook/linter even without spamming the tox environments.

Example: `pre-commit run flake8` can be run via tox as `tox -e linters -- flake8` -- that is the same pattern that people use to run specific unittests with tox.