resolver: opcode IQUERY must return NOTIMPL

IQUERY was obsoleted by RFC 3425 so we use it to test how resolver responds to unknown opcodes.

This needs to wait till knot-resolver#225 (otherwise we would break Deckard CI).

added 38 commits

• abd83e87...474fa41b - 37 commits from branch master
• 2eecbeab - resolver: opcode IQUERY must return NOTIMPL

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