resolved: don't forget about lost OPT and RRSIG when downgrading a feature level

Certain Belkin routers appear to implement a broken DNS cache for A RRs and some others, but implement a pass-thru for
AAAA RRs. This has the effect that we quickly recognize the broken logic of the router when we do an A lookup, but for
AAAA everything works fine until we actually try to validate the request. Given that the validation will necessarily
fail ultimately let's make sure we remember even when downgrading a feature level that OPT or RRSIG was missing.

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