Instead of dEQP_GLES2.Default/functional.blah...
Use dEQP.GLES2/functional.blah...

This makes them a bit easier to parse and reconstruct from memory.

Bug: angleproject:2557
Change-Id: I092dc6ef10d4451ddafe373e699a5d35247f8785
Reviewed-on: https://chromium-review.googlesource.com/1062065Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>