Draft: cache: turn off QNAME minimization in deeper zones

This matches behavior of kresd <= 1.5.3 - check_empty_nonterms(...) Currently the iterator is unable to do QNAME minimization in deeper zones, so switching it off is the only thing to do for now :-/

Fixes https://gitlab.labs.nic.cz/knot/knot-resolver/issues/316

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• f04bd696 - 1 commit from branch master
• 577ac9c1 - cache: turn off QNAME minimization in deeper zones

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added 3 commits

• 577ac9c1...801daaca - 2 commits from branch master
• 39d4447c - cache: turn off QNAME minimization in deeper zones

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marked as a Work In Progress

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assigned to @gdemidov

added performance label

changed milestone to %2018 Q4

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changed title from Draft: WIP: cache: turn off QNAME minimization in deeper zones to Draft: cache: turn off QNAME minimization in deeper zones