Merge pull request #1791 from majestrate/exclude-failing-from-queue-2021-10-29

exclude fully failed nodes from service node testing list

llarp/consensus/reachability_testing.cpp

@@ -124,7 +124,8 @@ namespace llarp::consensus
       auto& [pk, retest_time, failures] = failing_queue.top();
       if (retest_time > now)
         break;
-      result.emplace_back(pk, failures);
+      if (failing.count(pk))
+        result.emplace_back(pk, failures);
       failing_queue.pop();
     }
     return result;