Send a protocol version as the first message from server, clients must
close communication if they don't support this protocol version.  Older
QEMUs should be fine with this change in the protocol since they
overrides their own vm_id on reception of an id associated to no
eventfd.
Signed-off-by: NDavid Marchand <david.marchand@6wind.com>
Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com>
[use fifo_update_and_get()]
Reviewed-by: NClaudio Fontana <claudio.fontana@huawei.com>