message: net: manually resolve dns seed sources
  Note: Some seeds aren't actually returning an IP for their name entries, so
  they're being added to addrman with a source of [::].
  This commit shouldn't change that behavior, for better or worse.
diff: @@ -1292,7 +1292,15 @@ void ThreadDNSAddressSeed()
  found++;
  }
  }
  - addrman.Add(vAdd, CNetAddr(seed.name, true));
  + // TODO: The seed name resolve may fail, yielding an IP of [::], which results in
  + // addrman assigning the same source to results from different seeds.
  + // This should switch to a hard-coded stable dummy IP for each seed name, so that the
  + // resolve is not required at all.
  + if (!vIPs.empty()) {
  + CService seedSource;
  + Lookup(seed.name.c_str(), seedSource, 0, true);
  + addrman.Add(vAdd, seedSource);
  + }
  }
  }
  