Code review comment for lp:~rvb/maas/fix-etc-hosts-bug-1087183-2

I'm not landing this just now as we want people to test it first.

fwiw, this is what happens on a deployed node with the current config: http://paste.ubuntu.com/8473237/

This is what happens with this change: http://paste.ubuntu.com/8473238/

The only difference is on the last line.