Remove the log to putRandomPort when one protocol use random port (#2931

)

* optimize findConfigedPorts method of ServiceConfig to log only one time when userandom port

* move the log to method putRandomPort

dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/ServiceConfig.java

@@ -170,6 +170,7 @@ private static void putRandomPort(String protocol, Integer port) {
         protocol = protocol.toLowerCase();
         if (!RANDOM_PORT_MAP.containsKey(protocol)) {
             RANDOM_PORT_MAP.put(protocol, port);
+            logger.warn("Use random available port(" + port + ") for protocol " + protocol);
         }
     }
 
@@ -654,7 +655,6 @@ private Integer findConfigedPorts(ProtocolConfig protocolConfig, String name, Ma
                     portToBind = getAvailablePort(defaultPort);
                     putRandomPort(name, portToBind);
                 }
-                logger.warn("Use random available port(" + portToBind + ") for protocol " + name);
             }
         }