I'm not sure why one files (written by Philipp)
did contain a GPLv2+ header, instead of the AGPLv3+ which is the
actual overall project license. I consider it a mistake.
In any case, any copyrightable contribution to those files was done by
sysmocom employees, so I as managing directory can legally make a
license change, whther or not it was a mistake early on or not.
Change-Id: Ie28c32022a9cbc42b55195f7dbb513228857a3cd