line from /etc/hosts
Ubuntu always uses 127.0.1.1 for that with some tricky sauce
around `hostname` depending on whether it contains '.' or not.
And when I mean `hostname` it's the one returned by `hostname`
command with no arguments.
ansible_hostname is always a single word so we can match on that.
I did not want to remove just any 127.0.1.1 in case someone
is using it for other purposes. :-)
Change-Id: I8bd3d42a5e3bd0f63336ed60a0af90d52b1650d6
Closes-bug: #1862739