* solve all shellcheck warnings
* shebang in all scripts
* set -eu everywhere
* make scripts callable from everywhere
* quote variables to prevent globbing and word splitting
* add missing copyrights
* remove unused variables
* use $() instead of backticks ``
... and so on
1- Some test names differ from default run_unnittest (e.g bin/dhcpv4/dhcpv4_unittest)
2- For some reason I didn't get, some test do not produce a valgrind.$PID file,
in which case the script exits. Fix this so that it continues.
It produces the output, but fails at the end reporting the status, needs
at last some documentation, etc. It might leave some files after the
run. It doesn't handle some parameters properly (problems with
escaping).
It is a big ugly bash script. But as it is to be used by the developers,
not users, it might not be so big problem.
