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Add new bot names to chromium.clang test configs

All bot names with "tester" in them will be removed after this build
config change goes live:
https://chromium-review.googlesource.com/c/chromium/tools/build/+/782619

R=dpranke@chromium.org, hans@chromium.org
NOTRY=true

Bug: 587879
Change-Id: I8448b6000b66fa24091040f57371091f1a138af8
Reviewed-on: https://chromium-review.googlesource.com/783518
Commit-Queue: Reid Kleckner <rnk@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Hans Wennborg <hans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#518404}