this fixes a bug where resolution failed, but the finish callbacks thought the answer is noerror

this hooks into query resolution and collects counters on answers, queries and iterator

This reverts commit 3f4d8cbe.

this fixes a regression when a final name has a dependency with a short
TTL in the search path, but has longer TTL itself
in another words - if there's a CDN in the middle and the name doesn't
exist, answer it from the cache without requerying the CDN

this saves space for both library and daemon

this allows for continuation of a function in the background,
a good use case for this is loading of chunks of data or I/O 

This reverts commit 3d1ee641.