Replace instances of python with python3 and ensure script integrity

[nderjung]

Feature request summary

This issue tracks replacing instances of python with python3 in Python scripts that have a hashbang preamble requesting the interpreter from /usr/bin/env.

In an effort both to deprecate any standing Python 2.X code in favour of Python3.X code and ensure support for building Unikraft works on macOS (#785), this issue requests to replace instances of python with python3 and ensure that all existing scripts work as expected.

Finally, replacing the global PYTHONCMD with python3.

Describe alternatives

No response

Related architectures

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Related platforms

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Additional context

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[Ecazares15]

Hello!

We are students from the University of Texas at Austin taking a virtualization course (cs360v) looking for opportunities to contribute to an open source project for class credit.

Could I be assigned to this?

[nderjung]

cc @skuenzer -- do you know the status of this?

[Ecazares15]

It looks like all instances of python have been replaced to python3. If the global PYTHONCMD is defined by what is listed in support/kconfiglib/makefile.patch then that still says +PYTHONCMD ?= python. I am not sure if that still needs an update?