Feature/update fix Testclient and Python Package to spport GRPC

[SebastianSchildt]

With the GRPC changes in #299, the client could only be executed locally. Python package and Docker where broken. This should fix it. Expectation ist

• testclient still works in (a pipenv) in a local source checkout
• Python package can be build
  • build with python setup.py bdist_wheel
• Docker container for testclient works
  • Build with docker build -t testclient -f kuksa_viss_client/Dockerfile . or wait for GH action and pull from ttl.sh before the image expires

Also, the python packaged related config files (setuptools stuff) have been moved into the kuksa_viss_client folder

[nayakned]

Tested all the three variants and found it to be working.

• Local
• Docker
• Built package inside a docker container and installed it.

Can be merged.