This change renames directories in preparation for the great package
rename. The repository is now in a broken state because the code
itself hasn't been updated. However this should ensure that git
correctly preserves history for each file.
This fixes a previous issue where metrics generated on the
tools/backend modules weren't being successfully exported to BigQuery.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=119047757