Fix multiple CI failures

1. Blacklist Ansible 2.9.8

Ansible 2.9.8 includes a regression on the fileglob plugin [1] that
causes the Kolla Ansible HAProxy role to fail.

This change blacklists Ansible 2.9.8 to work around the issue.

2. Use ensure-docker role instead of install-docker

The install-* roles are being deprecated and renamed to follow the
ensure-* naming convention [2].

[1] https://github.com/ansible/ansible/issues/69450
[2] http://lists.zuul-ci.org/pipermail/zuul-announce/2020-April/000071.html

Change-Id: Iab1d84e6a8c1b3dd81e53279309153687677a061
Story: 2007659
Task: 39748