fix up /etc/aliases with puppet
our new-machine checklist includes
* fix `/etc/aliases`:
( ! grep '^root:' /etc/aliases && echo 'root: torproject-admin@torproject.org' >> /etc/aliases ) &&
sed -i -e 's/^root:.*/root: torproject-admin@torproject.org/' /etc/aliases && newaliases
This should probably just move into puppet.