message: p2p: process more candidates per protection iteration
  for the usual case when some of the protected networks
  don't have eviction candidates, to reduce the number
  of iterations in ProtectEvictionCandidatesByRatio().
  Picks up an idea in that I had dropped.
diff: @@ -943,9 +943,7 @@ void ProtectEvictionCandidatesByRatio(std::vector<NodeEvictionCandidate>& evicti
  while (num_networks != 0 && num_protected < max_protect_by_network) {
  const size_t disadvantaged_to_protect{max_protect_by_network - num_protected};
  - const size_t protect_per_network{
  - std::max(disadvantaged_to_protect / networks.size(), static_cast<size_t>(1))};
  -
  + const size_t protect_per_network{std::max(disadvantaged_to_protect / num_networks, static_cast<size_t>(1))};
  // Early exit flag if there are no remaining candidates by disadvantaged network.
  bool protected_at_least_one{false};
  