Leandro Ribeiro authored Oct 17, 2020 and Pekka Paalanen committed Oct 27, 2020

This is a follow-up of commit "tests: start to use Weston's
default screenshooter in the test suite".

As we've started to use Weston's default screenshooter
implementation and protocol extension in the test suite,
we don't need what we've created specifically for the test
suite anymore.

Drop test suite screenshooter implementation and protocol
extension.

Signed-off-by: Leandro Ribeiro <leandro.ribeiro@collabora.com>