Remove redundant tests

[masci]

Remove integration tests that were ported to Python.

[cmaglie]

Tests running inside the go file have the advantage to add coverage.

[rsora]

@cmaglie I guess we could add something like pytest-cov to the testing part, anyway this PR addresses integration testing (read: cli response to user command), so the coverage concept applied to this context needs to be developed more internally as we iterate on the project.
ATM we are leveraging the python ease of use to develop high level testing routines faster, and build a baseline of usecases to iterate with more speed having solid safe-net .

[masci]

I'm going ahead and merge this because Go tests are outdated and failing while I need a clean run to setup Appveyor and I don't want to replicate fixes in two places at this stage.