This is follow-up to catch up with weston's way of loading the
compositor instance. This is necessary because the test itself is
capable of loading a specific compositor instance (and with, specific
arguments).
No functional changes whatsoever.
Bug-AGL: SPEC-3889, SPEC-3880
Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
Change-Id: Iedb979156a73def4567927969ab9190c481ffbce