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.
See bug for context. This way gTech can create credits in the future
without our intervention.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=120382506