When using SystemD, NetworkManager is started directly, so use this way.
/etc/init.d/qubes_core_netvm doesn't exists in such system... Even when existed
- it was already started and SystemD doesn't allow to start it again (unlike
upstart/sysvinit).
Actually this is run for every VM with PCI device, so it can be AppVM, not
NetVM. qubes_core_netvm will check if it is NetVM before starting
NetworkManager.
This is core part of migration. Things not migrated yet:
- DispVM (qubes_restore needs to be almost rewritten)
- VM xen config files should be fixed (use "script:" prefix in block device description, perhaps generate this files on VM start)
Huge, slow xend not needed any more, now it conflicts with libxl
