setup.py: Specify dependency versions explicitly
setup.py: Specify dependency versions explicitly

To avoid support headaches. This way the behaviour will match what's on
the Stb-tester Node hardware.

I have also specified opencv-python as an explicit dependency. If the
user wants a different version of opencv (e.g.
opencv-contrib-python-headless) they can install it in a separate venv.

stb-tester/stb-tester,stb-tester/stb-tester,stb-tester/stb-tester,stb-tester/stb-tester