Ansible-lint is required for Ansible collection
certification for Automation Hub.
gcsfuse had no metadata associated with it, failing
the Ansible Hub upload.
Ansible role tests were failing due to ansible-lint reporting
multiple errors.
Fixing those errors resolves the failing tests.
Switching gcsfuse to use gcloud's bootstrap to follow the current
docker install instructions.
Removing centos as it's a discontinued distribution.
Adding a check to ensure integration tests are skipped unless they
are run by a branch (a public fork does not pass required
integration test credentials).