Miscellaneous CI fixes
Fixes the following issues:
- The Xephyr test suite was mis-spelled as
xephr
- Rebuilding the docker image results in two XTS tests failing (exclude them for now)
-
weston
wasn't installed anymore, resulting in Xwayland tests getting skipped - The CI was not using fixed commits of the
piglit
,rendercheck
&xts
repositories
Also adds a check for all expected piglit results being there, which would have caught issue 3.