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The presubmit check ensures that the builders are sorted, first by group,
then by name. It also ensures that the file generated by the script is up
to date.

Bug: 902507

Change-Id: Iaaf7048b6b6edcc99befff7c3e8602adfd2c5681
Reviewed-on: https://chromium-review.googlesource.com/c/1327809
Commit-Queue: Stephen Martinis <martiniss@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609422}