This replace the non-descriptive digit at the end of the test name by
the name of the configuration being tested.

BUG=angleproject:1153

Change-Id: Ieed08c8e5f111c079c183dd96cf3fe1cfff52f7f
Reviewed-on: https://chromium-review.googlesource.com/296685Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Tested-by: Corentin Wallez <cwallez@chromium.org>