runtest/dio: enable dio29/30

Not sure why dio29 and dio30 are commented out, I found a bug in
4.10 kernel by running them, see this patch

https://patchwork.kernel.org/patch/9598823/

So let's enable them by default.

Signed-off-by: Eryu Guan <eguan@redhat.com>
diff --git a/runtest/dio b/runtest/dio
index 97820e9..a26e001 100644
--- a/runtest/dio
+++ b/runtest/dio
@@ -40,8 +40,8 @@
 dio28 diotest6 -b 8192 -o 1024000 -i 1000 -v 200
 
 ### Run the tests with more children
-#dio29 diotest3 -b 65536 -n 100 -i 1000 -o 1024000
-#dio30 diotest6 -b 65536 -n 100 -i 1000 -o 1024000
+dio29 diotest3 -b 65536 -n 100 -i 1000 -o 1024000
+dio30 diotest6 -b 65536 -n 100 -i 1000 -o 1024000
 #
 # RAW DEVICE TEST SECTION
 #   DEV1 and DEV2 should be exported prior to execution or