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In Zed cycle, we have dropped the python 3.6/3.7[1] testing and its support. Removing the py36 centos8 job as well as updating the python classifier also to reflect the same. [1] https://governance.openstack.org/tc/reference/runtimes/zed.html Change-Id: I205e4e91d1560e155d6f443051fb778cd1de5d80