Resolve all domains in the DNS chain

[agneevX]

Hello.

An option should be added to dnsproxy that resolves all CNAMEs in a DNS chain, instead of just returning what the upstream server has sent.

While this will add a considerable amount of latency, it is prudent to ensure that the cache is not poisoned and is a very important feature that other recursors such as Unbound and BIND have implemented inherently.

[ameshkov]

Tbh, I am skeptical about this one. This is recursor's job to resolve the whole chain.