Revert "no need to flush stderr in my tests"
Revert "no need to flush stderr in my tests"

It is actually necessary, for now.

This reverts commit 8fdd1eddf91a3d5dbc013ba6e4a170f8613598c0.

Conflicts:
	borg/helpers.py

edgewood/borg,RonnyPfannschmidt/borg,RonnyPfannschmidt/borg,mhubig/borg,raxenak/borg,edgimar/borg,edgimar/borg,edgewood/borg,edgimar/borg,raxenak/borg,mhubig/borg,edgewood/borg,mhubig/borg,RonnyPfannschmidt/borg,edgimar/borg,RonnyPfannschmidt/borg,raxenak/borg,RonnyPfannschmidt/borg,edgewood/borg,raxenak/borg