Inroduce a way to not take a 2x performance hit when testing. It
is of importance if we run with hundreds of BTSes and 10k+ subscribers.
In the absence of using getops or shflags use an environment for it.
Change-Id: I540ba1c35e8fb72abcee0d86e0bdc1136b47345c
As it's quite complex to build osmocom firmware nowadays (a specific old
release of gcc and binutils are required to build it), instead download
the already built binaries from OBS.
Change-Id: I2571268d91e2430a270e51438608e7dbd121e76d