Set genesis time when running only network clients

Otherwise we get potentially no or erratic ETA reporting,
depending on the system.

Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/fio.c b/fio.c
index 7e6b06d..9adc29a 100644
--- a/fio.c
+++ b/fio.c
@@ -43,6 +43,8 @@
 	fio_time_init();
 
 	if (nr_clients) {
+		set_genesis_time();
+
 		if (fio_start_all_clients())
 			return 1;
 		return fio_handle_clients(&fio_client_ops);