Handle removal of ConfigParser.readfp() in Python 3.12 #4494
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Per https://docs.python.org/3.12/whatsnew/3.12.html#removed , configparser.ConfigParser.readfp() is removed in Python 3.12. Assuming we still want to keep Python 2 compatibility, since there are still a bunch of uses of six in the codebase, I've changed this to do it the same way as it's done in freeipa ipaserver/install/certs.py, using readfp on Python 2 and read_file on Python 3.