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In order to generate internal testing JSON files, the configuration
files must be read from src-internal rather than src or all of the
builders will be flagged as unknown.

Bug: 1078933
Change-Id: Ic659675778256c7fb2e2df5409dbc35e72ff3b46
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2186451
Commit-Queue: Garrett Beaty <gbeaty@chromium.org>
Reviewed-by: Stephen Martinis <martiniss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#766448}