only start the resolver if tproxy mode #2715
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Nest the resolver, a privileged listener, under tproxy mode. That way, the router process doesn't spew errors about lacking permission to bind privileged port 53 unless it's actually necessary to listen for DNS queries on the specified resolver address in the tunnel binding options. This change reflects the earlier modifications to the non-RDM xgress router tunneler interface in #2483 .