including a config file and overriding some properties is
helpful when we do not want to modify the original config
but run it with sligthly different properties.
this involves some redesign a.o.:
- modules are collected in a dict instead of a list in
order for 'override' to find the related module
- checking for duplicates happens in the Collector
Do not warn when included file does not end with '_cfg.py',
as this may be intentional, in case a file is only used
via 'include' and not as cfg file alone.
+ remove unused method Collector.append
+ complain with specific error message when Node is not given
Change-Id: Id568f04d6d84622ef2547412eb6f288fcebf986f
Reviewed-on: https://forge.frm2.tum.de/review/c/secop/frappy/+/36357
Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de>
Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>
