We have successfully removed debian buster from nodepool and zuul at
this point. The last major TODO in debian buster cleanup is to remove it
from our package mirrors. This change is the first step in making that
happen.
For step two we follow the manual process documented in our reprepro
docs [0] for cleaning up mirror components. We will need to perform
these actions against the debian, debian security, and ceph octopus
mirrors.
[0] https://docs.opendev.org/opendev/system-config/latest/reprepro.html#removing-components
Depends-On: https://review.opendev.org/c/openstack/project-config/+/910031
Change-Id: Ic1fc6a45cb7f644d7862312589254b6100e17222
7136db339e