[Intel-gfx] [PATCH i-g-t] igt_core: Skip sync when listing subtests

[Chris Wilson]

Quoting Tvrtko Ursulin (2017-07-21 14:00:27)
> From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> 
> No need to sync filesystems when only listing subtest.
> 
> Extremely marginal benefit of avoid a short stall after make
> followed by listing subtests.

Ah, I was looking for the sync recently, to move it to common_init()
alongside the other common adjustments (oom_adjust_for_doom() etc).
-Chris