Remove *-cli.c files in src/app/clusters

[vivien-apple]

Problem

There are a few *-cli.c files in src/app/clusters that are not used at the moment. They also probably do not even compile since most of them are tied to some headers (e.g app/util/serial/command-interpreter2.h) that we do not have nor use.

I also remove some .xml and .info. files. I have no idea how they end up here. And finally I remove a -test.h` file that nobody uses...

Summary of Changes

• Remove *-cli.cfiles from src/app/clusters
• Remove *.xml files from src/app/clusters
• Remove *.info files from src/app/clusters
• Remove *-test.h unused files from src/app/clusters