Currently, attempting to use Trusty (14.04) VMs causes VMs to not
provision correctly due to a grub-install error. With respect to this
specific issue, this commit updates vm.preseed.j2 by removing some
grub-installer options which were not present before the ansible
rewrite.
Secondly, with that change in place, VMs do not come online on their
10.0.236 addresses as something is overwriting
/etc/networking/interfaces, which wipes out the source of the
/etc/network/interfaces.d directory. Bug [1] seems to indicate this
is in fact an issue and has been resolved, however attempts at using
this preseed option (netcfg/target_network_config) were not successful.
As a workaround, we simply chattr +i the interfaces file in
vm-post-install-script.sh.j2, and then remove the attr in
deploy-vms.yml when the instance is up an accessible.
[1] https://bugs.launchpad.net/ubuntu/+source/netcfg/+bug/1361902
Change-Id: I12d0c5108d1df0ab02b69d1b8cdb271a02999602
ce29ea23d1