Hard to start local kuksa_viss client when an older version is installed in system

[SebastianSchildt]

If a system has an installed version of kuksa_viss_client, and in a source directory you try to start it amnually doing

python3 __main__.py

You get (partially) the system installed version. I think this is due to to the search paths defaulting to system first.

A fix seems to be to replace

https://github.com/eclipse/kuksa.val/blob/c3739d5c6f1ef68a16cebca52c14670858ec48a8/kuksa_viss_client/__main__.py#L23

with

sys.path.insert(0,os.path.join(scriptDir, ".."))

Not sure this has negative implications when isntalled system wide

[SebastianSchildt]

This should work now, but we should really explain how to set up a clean pipenv for the testclient