server: include number of CPUs in probe reply

We'll need this for affinity mask setting. Also add room
for flags, we'll want to pass back a flag mask of supported
features on the remote end.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/server.c b/server.c
index c859ad7..2bf74b2 100644
--- a/server.c
+++ b/server.c
@@ -630,8 +630,9 @@
 
 	probe.os	= FIO_OS;
 	probe.arch	= FIO_ARCH;
-
 	probe.bpp	= sizeof(void *);
+	probe.cpus	= __cpu_to_le32(cpus_online());
+	probe.flags	= 0;
 
 	return fio_net_send_cmd(server_fd, FIO_NET_CMD_PROBE, &probe, sizeof(probe), &tag, NULL);
 }