tests: Improve output when running debugfs.
tests: Improve output when running debugfs.

Changelog: None

Signed-off-by: Kristian Amlie <505e66ae45028a0596c853559221f0b72c1cee21@northern.tech>

pasinskim/integration,GregorioDiStefano/integration,pasinskim/integration,pasinskim/integration,GregorioDiStefano/integration