fix issue where ttys aren't correctly set after restore

fix issue where ttys aren't correctly set after restore

restore from unpriv to priv causes a problem with the log-in from web
console, since the /etc/securetty file isn't modified after a restore to
reflect that change (/dev/lxc/tty1 and so on).

template_fixup is normally called in post_create_hook, but we have no
$password or $ssh_keys to call the hook with during the restore. instead
we call template_fixup by itself to fix the ttys on some distributions.

Signed-off-by: Oguz Bektas <o.bektas@proxmox.com>
Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>