tests/gem_eio: Never re-use contexts which were in the middle of GPU reset

Contexts executing when reset triggers are potentialy corrupt so trying to
use them from a subsequent test (like the default context) can hang the
GPU or even the driver.

Workaround that by always creating a dedicated context which will be
running when GPU reset happens.

v2:
 * Export and use gem_reopen_device so the test works on old gens as well.
   (Chris Wilson)

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>

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