aio02: runfstests.sh should be deleted

runfstests.sh is creating temporary directory, which could be easily done
withing the test itself by using tst_tmpdir(), So runfstests.sh should be
deleted.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
diff --git a/runtest/io b/runtest/io
index a52d053..00032ff 100644
--- a/runtest/io
+++ b/runtest/io
@@ -1,3 +1,3 @@
 #AIO01 & AIO02 tests to be run
 aio01 aio01
-aio02 runfstests.sh -a aio_tio
+aio02 aio_tio