Checkstyle fixes

Author: dagnir

http-clients/netty-nio-client/src/main/java/software/amazon/awssdk/http/nio/netty/internal/AutoReadDisableChannelPoolListener.java

@@ -16,10 +16,12 @@
 package software.amazon.awssdk.http.nio.netty.internal;
 
 import io.netty.channel.Channel;
+import software.amazon.awssdk.annotations.SdkInternalApi;
 
 /**
  * Disables auto read on in-use channels to allow upper layers to take care of flow control.
  */
+@SdkInternalApi
 public class AutoReadDisableChannelPoolListener implements ListenerInvokingChannelPool.ChannelPoolListener {
     private static final AutoReadDisableChannelPoolListener INSTANCE = new AutoReadDisableChannelPoolListener();
 

http-clients/netty-nio-client/src/main/java/software/amazon/awssdk/http/nio/netty/internal/AutoReadEnableChannelPoolListener.java

@@ -16,10 +16,12 @@
 package software.amazon.awssdk.http.nio.netty.internal;
 
 import io.netty.channel.Channel;
+import software.amazon.awssdk.annotations.SdkInternalApi;
 
 /**
  * Enables auto read on idle channels so that any data that a service sends while it's idling can be handled.
  */
+@SdkInternalApi
 public class AutoReadEnableChannelPoolListener implements ListenerInvokingChannelPool.ChannelPoolListener {
     private static final AutoReadEnableChannelPoolListener INSTANCE = new AutoReadEnableChannelPoolListener();
 

http-clients/netty-nio-client/src/main/java/software/amazon/awssdk/http/nio/netty/internal/AwaitCloseChannelPoolMap.java

@@ -26,10 +26,8 @@
 import java.net.URI;
 import java.net.URISyntaxException;
 import java.time.Duration;
-import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
-import java.util.List;
 import java.util.Map;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.ConcurrentHashMap;