[python-experimental] drop python2, switch to python3 only #6987
Description
spacether
Issue body actions
- remove future from templates + samples
- remove six from templates + samples
- remove mock from tests
- remove python2 target from make command
- remove 2.7 from travis.yml, .gitlab-ci.yml, tox.ini
- add python3 to as a requirement to setup.py
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