Use log_info() throughout

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/engines/net.c b/engines/net.c
index 51bc671..f7e4f2d 100644
--- a/engines/net.c
+++ b/engines/net.c
@@ -111,7 +111,7 @@
 	struct pollfd pfd;
 	int ret;
 
-	fprintf(f_out, "fio: waiting for connection\n");
+	log_info("fio: waiting for connection\n");
 
 	/*
 	 * Accept loop. poll for incoming events, accept them. Repeat until we