Fix platform_asic_checker script in order to run stretch Python 3.5.3 #9030
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Why I did it
It is required by stretch/sonic-device-data_1.0-1_all.deb, which is required by docker-sonic-mgmt.gz.
Stretch distribution has old Python 3.5.3.
scandir.close() is new in Python version 3.6.
ref: https://docs.python.org/3/library/os.html#os.scandir.close
How I did it
How to verify it
Which release branch to backport (provide reason below if selected)
Description for the changelog
A picture of a cute animal (not mandatory but encouraged)