[Intel-gfx] [CI] drm/i915/selftests: Add basic sanitychecks for execlists

[Chris Wilson]

Quoting Chris Wilson (2018-04-04 10:33:29)
> Before adding a new feature to execlists submission, we should endeavour
> to cover the baseline behaviour with selftests. So start the ball
> rolling.
> 
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Michał Winiarski <michal.winiarski at intel.com>
> CC: Michel Thierry <michel.thierry at intel.com>
> Cc: Jeff McGee <jeff.mcgee at intel.com>
> Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
> Reviewed-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>

Thanks for the review, applied this version that checkpatch is almost
happy with (dear checkpatch, it has to be a rhs so no side effects and
repetition is essential).
-Chris