Fix regression introduced by commit 334185e

We need to run fio_time_init() before the threads are invoked,
but we should do it in global context so that all threads share
the same clock and init settings.

Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/server.c b/server.c
index 077dce5..8865502 100644
--- a/server.c
+++ b/server.c
@@ -555,6 +555,7 @@
 	pid_t pid;
 	int ret;
 
+	fio_time_init();
 	set_genesis_time();
 
 	pid = fork();