The check might be as simple as running a recursive grep over system/ in built distribution, and confirming it returns no duplicated matches.

That would verify the first part of what Robert says [0]:
"At the end of the day, every ODL jar file should be part of EXACTLY ONE
feature and that feature MUST reside in the same project as the source
code used to build that jar."

I guess the same should be required for config files, but it might be harder to grep for all the different classifiers.

[0] https://lists.opendaylight.org/pipermail/release/2017-September/012356.html