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>
79491b41f5