tuleap-lister: fix args in test_task.

tuleap-lister: Add rate-limiting test + fix debug and typo.

tuleap-lister: code review: fix mocker + tests/setup_cli.

tuleap-lister: code review: fix relister > lister.

tuleap-lister: code review: fix test_task kwargs.

tuleap-lister: code review: Remove authentication useless lines + fix typos.

tuleap-lister: code review: improve results_simplified for svn repos.

tuleap-lister: code review: add name to CONTRIBUTORS file.

tuleap-lister: code review: Update tutorial for misc files to edit.

tuleap-lister: code review: Update copyright to 2021 exactly.

tuleap-lister: code review: Update py files perms -X.

tuleap-lister: code review: minimise json files.

tuleap-lister: code review: fix chmod on json files.

tuleap-lister: code review: fix var names + add tests.

tuleap-lister: code review: fix useless indirection.

tuleap-lister: code review: Add empty repo test, minor typo fixes.