The methods in DomainBase were the only callers for the methods in
EppResourceUtils, so I first inlined them. Then I realized that there
were no callers for loadReferencedContacts() anywhere. For loadNameservers(),
all but one invocation actually wanted to load the foreign keys, and was
repeating that work, so I replaced it with loadNameserverFullyQualifiedHostNames().
The last invocation, in the Rdap code, was incorrectly assuming this was an async
load when in fact it blocks, so I replaced it with a real async load.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=122433897
d9875ea302