bindings: python: tests: package the python test-suite in the dist tarball
bindings: python: tests: package the python test-suite in the dist tarball

The test-suite python scripts is added to bin_SCRIPTS in Makefile.am.
This means it's not distributed by default. Add it to dist_bin_SCRIPTS
and make it part of the distribution tarball.

Fixes: 452696601ae5 ("bindings: python: use unittest to implement a proper test-suite")
Signed-off-by: Bartosz Golaszewski <e5d45fddd9040473413b909b802f629a971ad04c@baylibre.com>

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