IO/Group/Policy Python API version is displayed instead of sudo version,
because that is not very meaningful in this context.
They are only displayed in verbose mode.
Example plugins express it more concrete that they are displaying their
version, not the API version.
If the plugin fails to open the file for writing, constructor will raise
an exception and exit before creating the "_log" member variable.
So the destructor will also raise a backtrace. (Which python ignores, but
dumps out to stderr.)