These fields are passed to methods like LoadBalancer::getConnection() and are
already expected to be DB domains. Update various comments as well.
Fix a few minor IDEA warnings.
Change-Id: I7cf76700690aec449872a80d30b5ba540d2bf315
Created class RevisionStoreCacheRecord to avoid returning stale
cached revision visibility and actor data when changes were
made after the cache was populated for that revision.
Bug: T216159
Change-Id: Iabed80e06a08ff0793dfe64db881cbcd535cb13f