Some of the command-line options change the behaviour such that positional
arguments are ignored. The program should not expect positional arguments in
this condition.

The presence of an option does not avoid the requirement for a positional
argument. So we enhance the test case to ensure the program exits with a failure
in this condition too.

The positional arguments are not in an obvious order, and keyword arguments are
not available. We need to carefully construct the exceptioninstance using the
arguments in the sequence expected for the standard exception classes, to get
the right parameters parsed.

The handling of user configuration file will soon change, so we need a separate
test case function for that.

We will soon be introducing multiple possible file paths for the user
configuration, so this one needs a more specific name.

This method is present on `urllib.Request` instances and some users expect it.

This property is present on `urllib.Request` instances and some users expect it.

The methods on `urllib.Request` have parameters with names that callers might
expect. Change the `AuthHandlerHackAround` method parameter names to conform to
those of the corresponding `Request` method parameters.