Cleanup fctx->finds before sending 'final' query after qname minimization.

Merged Witold Krecicki requested to merge 16-cleanup-finds-before-sending-final-query into master

At the beginning of qname minimization we get fctx->finds filled with what's in the cache at this point, in worst case root servers. After doing full run querying for NSes at different levels we need to clean it and refill it with proper values from cache.

Closes #16 (closed)

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