Only look if minio is available if needed

Ash McKenzierequested to merge
ashmckenzie/only-check-minio-if-object-storage-enabled into master

What does this Merge Request do?

When running the GDK preflight checks, only error out when minio is not installed if config.object_store.enabled? is true.

Merge Request checklist

  • Tests added for new functionality. If not, please raise Issue to follow-up.
  • This change is backward compatible. If not, please include steps to communicate to our users.
  • Documentation added/updated, if needed.
  • gdk doctor test added, if needed.

Merge request reports