dht: add connectivityChanged()

src/dht.cpp

@@ -1705,6 +1705,17 @@ Dht::expireStorage()
     }
 }
 
+void
+Dht::connectivityChanged()
+{
+    confirm_nodes_time = now;
+    mybucket_grow_time = now;
+    mybucket6_grow_time = now;
+    for (auto& s : searches)
+        for (auto& sn : s.nodes)
+            sn.listenStatus = {};
+}
+
 void
 Dht::rotateSecrets()
 {