[#674] network: Close connections on address updates

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>

pkg/network/cache/multi.go

@@ -130,6 +130,7 @@ loop:
 				continue loop
 			}
 		}
+		x.clients[a].invalidate()
 		delete(x.clients, a)
 	}