igt/tools_test: Check the tools exist before executing

As a simple fail-safe against a bad installation, check the tools exist
before testing whether they work.

v2: Check intel_l3_parity as well
v3: Hunt for tools/

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=102935
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Petri Latvala <petri.latvala@intel.com> #v1
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> #v1
1 file changed