[Pkg-salt-team] salt is marked for autoremoval from testing

[Debian testing autoremoval watch]

salt 3000+dfsg1-4 is marked for autoremoval from testing on 2020-05-04

It (build-)depends on packages with these RC bugs:
953970: python-boto: autopkgtest failure with Python 3.8 as default
954625: pytest-httpbin: FTBFS: dh_auto_test: error: pybuild --test --test-pytest -i python{version} -p "3.7 3.8" returned exit code 13