pbr: simplify resolver prefill helper to avoid blocking#55

pesa1234 wants to merge 1 commit intomossdef-org:1.1.9mossdef-org/pbr:1.1.9from

pesa1234:1.1.9-fix-pbrdnsprefetchpesa1234/pbr:1.1.9-fix-pbrdnsprefetchCopy head branch name to clipboard