New versions of ducktape released for all python3 branches

[stan-is-hate]

Hi all!

We've just released the following versions of ducktape:

• 0.8.17
• 0.9.3
• 0.10.2
• 0.11.1

These releases contain no new functionality, the only thing that changes is that we've removed tox from dependencies.
0.11.1 also includes a newer version of jinja2.

The reason for that is a recent breakage under python 3.7 caused by recent update to virtualenv:

• ducktape required tox==3.20.0
• tox==3.20.0 requires virtualenv>16.0.0 and importlib-metadata<2 - https://github.com/tox-dev/tox/blob/3.20.0/setup.cfg#L38
• virtualenv 20.16.3 was released a couple of days ago and it bumped some deps - it now requires importlib-metadata>=4.8.3, making it incompatible with tox==3.20.0 - https://github.com/pypa/virtualenv/blob/20.16.3/setup.cfg#L35

We could've bumped the tox version, but since we don't actually use it anywhere in our code, we've decided we'd rather get rid of it entirely.