Get rid of KiB vs KB distinction

Confuses more than it does good, drop it and default to just using KB,
MB, etc.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/fio.c b/fio.c
index fc6dd8a..ba9e384 100644
--- a/fio.c
+++ b/fio.c
@@ -223,7 +223,7 @@
 				if (rate < ratemin ||
 				    bytes < td->rate_bytes[ddir]) {
 					log_err("%s: min rate %u not met, got"
-						" %luKiB/sec\n", td->o.name,
+						" %luKB/sec\n", td->o.name,
 							ratemin, rate);
 					return 1;
 				}