HBASE-27278 Improve TestTlsIPC to reuse existing IPC test code

hbase-client/src/main/java/org/apache/hadoop/hbase/ipc/AbstractRpcClient.java

@@ -230,7 +230,7 @@ public static String getDefaultCodec(final Configuration c) {
    * Encapsulate the ugly casting and RuntimeException conversion in private method.
    * @return Codec to use on this client.
    */
-  Codec getCodec() {
+  protected Codec getCodec() {
     // For NO CODEC, "hbase.client.rpc.codec" must be configured with empty string AND
     // "hbase.client.default.rpc.codec" also -- because default is to do cell block encoding.
     String className = conf.get(HConstants.RPC_CODEC_CONF_KEY, getDefaultCodec(this.conf));
@@ -251,7 +251,7 @@ public boolean hasCellBlockSupport() {
   }
 
   // for writing tests that want to throw exception when connecting.
-  boolean isTcpNoDelay() {
+  protected boolean isTcpNoDelay() {
     return tcpNoDelay;
   }
 

hbase-client/src/main/java/org/apache/hadoop/hbase/ipc/NettyRpcClient.java

@@ -72,7 +72,7 @@ public NettyRpcClient(Configuration configuration, String clusterId, SocketAddre
   }
 
   /** Used in test only. */
-  NettyRpcClient(Configuration configuration) {
+  public NettyRpcClient(Configuration configuration) {
     this(configuration, HConstants.CLUSTER_ID_DEFAULT, null, null);
   }
 

hbase-client/src/main/java/org/apache/hadoop/hbase/ipc/NettyRpcConnection.java

@@ -281,7 +281,7 @@ private void connect() throws UnknownHostException {
       .option(ChannelOption.TCP_NODELAY, rpcClient.isTcpNoDelay())
       .option(ChannelOption.SO_KEEPALIVE, rpcClient.tcpKeepAlive)
       .option(ChannelOption.CONNECT_TIMEOUT_MILLIS, rpcClient.connectTO)
-      .handler(new ChannelInitializer() {
+      .handler(new ChannelInitializer<Channel>() {
         @Override
         protected void initChannel(Channel ch) throws Exception {
           if (conf.getBoolean(X509Util.HBASE_CLIENT_NETTY_TLS_ENABLED, false)) {