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Update for plugin version 1.22.
We may have an error string for functions that return SUDO_RC_REJECT.
In C23 the constness of string function returns depends on the first arg
Use #include <foo.h> instead of #include "foo.h" in most cases.
Make most python tests pass with Python 3.4 Dictionary order is not stable in Python < 3.6 so we need to sort by key to have consistent results. The LogHandler output is also different on older Python versions. Also, don't stop running python tests after the first error.
plugins/python/regress: add a failing textcase about python plugins affect each other
plugins/python/regress: add test for callback error msg return
Remove Open Source PVS-Studio comments