To allow selecting tests with tags, tasks essential tasks need to be
tagged as always to ensure that they are not accidentally skipped when
specifying a tag for a test.
Instead of determining the non-default provider, run all integration
tests explicitly for both providers or only the providers that are
required. Since Ansible does not allow to pass variables to playbooks
imported with `import_playbook` to select another playbook to import,
generate the files instead of using a shared playbook like
`run_with_nm.yml` or `run_with_initscripts.yml`.
- Amend and add files to run integration tests against the provider that
was not autodetected, too.
- Add check to ensure that all integration tests run against both
providers
- Run black check for all python scripts
