runner/autopkgtest: virt-ssh gets confused by newlines in create_command
In my testing, autopkgtest-virt-ssh fails with:
sh: 1: nOUT=Reading: not found
where the 'n' in front of 'OUT' should be the newline. I think this means
that autopkgtest-virt-ssh has been broken since commit daf137e26, but
as I started working on bug 1068588 by copying virt-ssh code, I rather
have this fixed.
ssh-setup/nova: explicitely set 'fqdn' in cloud-init
Letting openstack set the fqdn adds an unwanted variable to the test
run, and can lead to unexpected results like the one described in
LP #2019472. Let's set the fqdn to a fixed value, as we do for the
hostname.