[CI] Fix Debian upgrade

Debian upgrades failed on using the ansible command to remove
chrony service because of broken python autodetection.
This patch uses the same workaround we have in globals-default.j2.
This is not nice long-term but there is no reason to keep the two
out of sync. We should remove this workaround from both places
when the situation fixes itself (possibly with newer Ansible).

Change-Id: I8b7f0c76d55cd31311285ce746acb6335e044470