bindings: python: test case for line flags
bindings: python: test case for line flags

Add a new test case verifying that line flags work as expected.

Signed-off-by: Bartosz Golaszewski <108de5fbc428215dc26df4468b48691526611148@gmail.com>

brgl/libgpiod,brgl/libgpiod,brgl/libgpiod,brgl/libgpiod