Ansible 2.9.8 includes a regression on the fileglob plugin [1] that
causes the HAProxy role to fail.
This change blacklists Ansible 2.9.8 to work around the issue.
[1] https://github.com/ansible/ansible/issues/69450
Change-Id: I12ca3b154fc7fed6a221880596e0acb5f6278bb7
Related-Bug: #1878192