perf: manage netty version

Author: leeyazhou

apm-sniffer/optional-plugins/netty-http-4.1.x-plugin/pom.xml

@@ -30,14 +30,12 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <netty.version>4.1.51.Final</netty.version>
     </properties>
 
     <dependencies>
         <dependency>
             <groupId>io.netty</groupId>
             <artifactId>netty-all</artifactId>
-            <version>${netty.version}</version>
             <scope>provided</scope>
         </dependency>
     </dependencies>

pom.xml

@@ -266,6 +266,13 @@
                 <artifactId>async-profiler</artifactId>
                 <version>${async-profiler.version}</version>
             </dependency>
+            <dependency>
+			    <groupId>io.netty</groupId>
+			    <artifactId>netty-bom</artifactId>
+			    <version>${netty.version}</version>
+			    <type>pom</type>
+			    <scope>import</scope>
+			</dependency>
         </dependencies>
     </dependencyManagement>