fix the naming service url and port is incorrect

apm-sniffer/apm-agent-core/src/main/java/org/skywalking/apm/agent/core/conf/Config.java

@@ -76,7 +76,7 @@ public class Config {
         /**
          * Collector service discovery REST service name
          */
-        public static String DISCOVERY_SERVICE_NAME = "/agentstream/grpc";
+        public static String DISCOVERY_SERVICE_NAME = "/agent/gRPC";
     }
 
     public static class Jvm {

apm-sniffer/config/agent.config

@@ -17,7 +17,7 @@ agent.application_code=Your_ApplicationName
 # Examples：
 # Single collector：SERVERS="127.0.0.1:8080"
 # Collector cluster：SERVERS="10.2.45.126:8080,10.2.45.127:7600"
-collector.servers=127.0.0.1:10800
+collector.servers=127.0.0.1:12800
 
 # Logging level
 logging.level=DEBUG