tools: revise install.py for minor improvements
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Use an with block for reading the config file. Refs: https://docs.python.org/3/tutorial/inputoutput.html#reading-and-writing-files
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Use explicit blank return to make it clear that the return value is not actually used and that it is being used for flow control only..
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
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