Implement LogfileHandler.getChild. This is needed to inherit
the configured level from the parent handler.
+ remove redundant assignmet of logfile_handler.max_days
Change-Id: I7277c28221bbb6108d75f2437634e9db9bf6761e
Reviewed-on: https://forge.frm2.tum.de/review/c/sine2020/secop/playground/+/28140
Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de>
Reviewed-by: Enrico Faulhaber <enrico.faulhaber@frm2.tum.de>
Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>
