#970: broctl stop/restart eating logs? (was: broctl restart eating logs?)

yeah, you're right. it works as long as the post-processors have their
file already open because then the file system won't delete it until
they are done. But seems that can go wrong if the post-processor is a
script with multiple steps, like with the trace-summaries.

Any suggestion how to fix it and make this determistic?

Robin