Add ipsets.yml

Contains "ghetto" ipsets which we use in firewall rules etc.

Signed-off-by: Alan Orth <alan.orth@gmail.com>
vars/Debian.yml: Switch to Liquid Telecom Ubuntu mirror

This should really be in an Ubuntu.yml file... but we currently
include it with ansible_os_family, instead of ansible_os_distribution.

Signed-off-by: Alan Orth <alan.orth@gmail.com>
vars/Debian.yml: Add vim modeline

Signed-off-by: Alan Orth <alan.orth@gmail.com>