upgrade netty version and fix miss dependency classes issue

apm-network/pom.xml

@@ -14,7 +14,7 @@
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <grpc.version>1.4.0</grpc.version>
-
+        <netty.version>4.1.12.Final</netty.version>
         <compiler.version>1.6</compiler.version>
     </properties>
 
@@ -23,6 +23,16 @@
             <groupId>io.grpc</groupId>
             <artifactId>grpc-netty</artifactId>
             <version>${grpc.version}</version>
+            <exclusions>
+                <exclusion>
+                    <groupId>io.netty</groupId>
+                    <artifactId>netty-codec-http2</artifactId>
+                </exclusion>
+                <exclusion>
+                    <groupId>io.netty</groupId>
+                    <artifactId>netty-handler-proxy</artifactId>
+                </exclusion>
+            </exclusions>
         </dependency>
         <dependency>
             <groupId>io.grpc</groupId>
@@ -34,6 +44,16 @@
             <artifactId>grpc-stub</artifactId>
             <version>${grpc.version}</version>
         </dependency>
+        <dependency>
+            <groupId>io.netty</groupId>
+            <artifactId>netty-codec-http2</artifactId>
+            <version>${netty.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>io.netty</groupId>
+            <artifactId>netty-handler-proxy</artifactId>
+            <version>${netty.version}</version>
+        </dependency>
     </dependencies>
 
     <build>

apm-sniffer/apm-agent-core/pom.xml

@@ -111,7 +111,6 @@
                                     <exclude>net.bytebuddy:byte-buddy:jar:</exclude>
                                     <exclude>com.google.errorprone:error_prone_annotations:jar:</exclude>
                                     <exclude>com.google.code.findbugs:jsr305:jar:</exclude>
-                                    <exclude>com.google.instrumentation:instrumentation-api:jar:</exclude>
                                 </excludes>
                             </artifactSet>
                             <relocations>