Pass input test name to inwer

[MasloMaslane]

This PR introduces passing test name to inwer as an argument. This will allow task creators to write inwers that will be able to verify if tests are in correct groups. It is a backwards-compatible change, because inwers shouldn't expect any arguments.

Related: https://github.com/sio2project/sioworkers/pull/22

[twalen]

But before merging please:

• resolve merge conflict
• make sure that all tests are passing

[MasloMaslane]

I had to change test_interactive_package.tgz, because if a file was passed as argument to inwer, it tried to open this file. I removed this logic.