This is an error condition that will soon throw an exception when
attempting to register the domain name, so it's good to let the registry
operator know of the error when it is first introduced.
Unfortunately there's still a backdoor that allows duplicate labels
that's harder to protect against (that this commit doesn't cover): the
case where reserved lists are already applied to a TLD, then one of the
reserved lists is updated to add another auth code, which then conflicts
with one on a different reserved list.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=149443007
ce4f3c0d56