Add a sleep at the end of fio-master script

Author: m-bull

images/fio/scripts/fio-master

@@ -11,4 +11,7 @@ fio_jobfile=$2
 # Moving output-format to the end of the command cleans up json output?
 # https://github.com/axboe/fio/issues/731#issuecomment-871259173
 
-stdbuf -o0 -e0 fio --client=${worker_hostfile} ${fio_jobfile} --output-format=json+
+stdbuf -o0 -e0 fio --client=${worker_hostfile} ${fio_jobfile} --output-format=json+
+
+# Add a sleep to make sure buffers are flushed
+sleep 2