realtime_back.py: organize fio arguments to be more legible
realtime_back.py: organize fio arguments to be more legible

It is a bit hard to track changes over time on this file
with regards to parameteres passed to fio. Splitting them up
line by line will let us read and understand changes proposed
more easily.

This change has no functional changes.

Signed-off-by: Luis Chamberlain <d4fa18192c5a479e564d29c2300c2e15afd1d8d7@kernel.org>

01org/fiovisualizer,01org/fiovisualizer