tests/functional: Remove unnecessary import statements

pylint complains about these unnecessary import statements,
so let's remove them.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20250414145457.261734-1-thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
20 files changed