feat: removed python2 support

[fstagni]

closes #263
closes #254

[aldbr]

Oops, I see some test failures in the integration tests in your branch, are they expected?

[fstagni]

Oops, I see some test failures in the integration tests in your branch, are they expected?

Yes I see those too, thank you for checking. The failures are there because the DIRAC certification setup is somehow broken. I did not yet look into that.

[chrisburr]

Why was this merged before removing the python 2 pilot tests from DIRAC?

Also 264587c is broken. The commit message talks about absolute imports when it's using relative ones and relative ones don't make sense in the way the pilotwrapper works.

[fstagni]

Why was this merged before removing the python 2 pilot tests from DIRAC?

Also 264587c is broken. The commit message talks about absolute imports when it's using relative ones and relative ones don't make sense in the way the pilotwrapper works.

Indeed, it was clearly not tested enough, yesterday I was trying to find an easy way out but failed to do it quickly. So, you did well to revert it for now.