Remove dependency on sh library

[ssbarnea]

• Main change is replace use of sh library with subprocess-tee while adopting a loose-coupling approach, so we do not rely on implementation details of the subprocess library.
• This will be part of 3.2.0 major release as it will likely break at least some plugins that are using molecule.util.run_command or the bake().
• It will initially be tagged as 3.2.0a0 in order to give time for plugin projects to adapt their test suites.
• This enables us to capture and process the output of the executed commands while still displaying it in real time, still no extra processing is done in this change.

Fixed: #2678
Related: amoffat/sh#450 amoffat/sh#512

[ghost]

I like the simplicity of subprocess-tee.

[decentral1se]

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