bindings: python: tests: extend reconfiguration tests

bindings: python: tests: extend reconfiguration tests

A number of the corner cases for reconfiguration are untested, including
 - using None for default settings
 - missing settings for some lines
 - jumbled line ordering relative to the request
 - extra settings for non-requested lines

Add tests for these corner cases.

Signed-off-by: Kent Gibson <warthog618@gmail.com>
Link: https://lore.kernel.org/r/20240626053808.179457-2-warthog618@gmail.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>