setup.py execution depends on current working directory

[SinaChavoshi]

This is a small issue that impacts users if they build the package from any folder other than python. For example if users runs the build package command as

python python/setup.py bdist_wheel

The build will complete with an empty package, source will not include any of the modules.
to mitigate this issue setup.py should set current working directory to setup.py location.

import os
setup_file_directory = os.path.dirname(os.path.abspath(__file__)
os.chdir(setup_file_directory)