add logger to dbmanager, thx Sephi

Signed-off-by: Michael Kaufmann (d00p) <d00p@froxlor.org>
Merge remote-tracking branch 'origin/0.9.31'
fixed search not calculating diskspace/traffic if no operator is used

Signed-off-by: Roman Schmerold (BNoiZe) <bnoize@froxlor.org>
Merge remote-tracking branch 'origin/0.9.31'