automate testing with setup.py

[sdimitro]

[ahrens]

I think these are the required commands:

cd tests/integration/data
aws s3 cp --no-sign-request s3://sdb-regression-dumps/dump-201912060006.tar.lzma .
tar -x --lzma -f dump-201912060006.tar.lzma
mv dump-data/* .
sudo apt install python3-pip
python3 -m pip install pytest pytest-cov
python3 -m pytest -v --cov sdb --cov-report term tests