Bundled googletest does not work with python3

[georgthegreat]

What language does this apply to?

All of the above.

Describe the problem you are trying to solve.

While trying to fix #8053 using @acozzette proposed soluton, I've run into trouble with running ./tests.sh cpp_distcheck: googletest package (1.8.0 plus some local patches) which is bundled as submodule apparently does not work with python3.

At least import sets (deprecates as of python2.6) and print statement (removed in python3) cause troubles.

My development server is running Ubuntu Focal which defaults to python3.

Describe the solution you'd like

Updating googletest to the latest released version (1.10) or just switching to googletest master.
Upon brief investigation, is has fixed most of the syntax errors.

Describe alternatives you've considered

So far, I have installed proxy package python-is-python2 which makes /usr/bin/python to point to python2.

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