dEQP: Shorten test case names. 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/1062065 Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>