Individual packages like dropbear, frr, iproute2 ... all came with a copy of
gitignore rules already present in the base file.
Those rules have been dropped.
All registered Git submodules were out of date. Even worse some of the modules
are no longer in use and have been replaced by upstream packages.
Keeping invalid information is even worse then no information. All required
VyOS packages can be found in the future build-packages script.
