So far we basically had two ways to iterate through NSS records: one via the varlink IPC and one via the userdb.[ch] infra, with slightly different implementations. Let's clean this up, and always use userdb.[ch] also when resolving via userdbd. The different codepaths for the NameServiceSwitch and the Multiplexer varlink service now differ only in the different flags passed to the userdb lookup. Behaviour shouldn't change by this. This is mostly refactoring, reducing redundant codepaths.
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