[WIP] Remove Python 2 support for Python client #8624
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Master Issue: #8622
Motivation
According to PIP 56, Python 2 should not be supported anymore. But the CMakeLists.txt still try to find include directory and library of Python 2.7 and the vagrant build script still build wheels for Python 2.
Modifications
Verifying this change
This change is a trivial rework / code cleanup without any test coverage.