run_on_target verbose mode doesn't print stdout realtime

[shuchitak]

When I specify verbose=True as an option in the xscope_fileio.run_on_target(), I still don't see stdout being printed in real time. For instance, if I'm printing frame number every frame, they appear every 800 frames or so. This makes debugging very hard, especially if the device is hanging or has crashed, in which case, no prints appear.

In order to debug, for now, I go back to the c75386d commit where stdout gets printed in real time.

[ed-xmos]

My update 0.4.0 appeared to work but is not performant enough (causes test failures in avona) so we have pinned at 0.3.2. This issue is still open.