use static inner class when can (#1981)

core/src/main/java/com/taobao/arthas/core/command/klass100/ClassLoaderCommand.java

@@ -627,7 +627,7 @@ public class ClassLoaderCommand extends AnnotatedCommand {
         }
     }
 
-    private class ClassLoaderInterruptHandler implements Handler<Void> {
+    private static class ClassLoaderInterruptHandler implements Handler<Void> {
 
         private ClassLoaderCommand command;
 

core/src/main/java/com/taobao/arthas/core/command/monitor200/MBeanCommand.java

@@ -349,7 +349,7 @@ public class MBeanCommand extends AnnotatedCommand {
     }
 
 
-    public class MBeanInterruptHandler extends CommandInterruptHandler {
+    public static class MBeanInterruptHandler extends CommandInterruptHandler {
 
         private volatile Timer timer;
 

core/src/main/java/com/taobao/arthas/core/distribution/impl/SharingResultDistributorImpl.java

@@ -135,7 +135,7 @@ public class SharingResultDistributorImpl implements SharingResultDistributor {
         }
     }
 
-    private class SharingResultConsumerImpl implements ResultConsumer {
+    private static class SharingResultConsumerImpl implements ResultConsumer {
         private BlockingQueue<ResultModel> resultQueue = new ArrayBlockingQueue<ResultModel>(DistributorOptions.resultQueueSize);
         private ReentrantLock queueLock = new ReentrantLock();
         private InputStatusModel lastInputStatus;

core/src/main/java/com/taobao/arthas/core/shell/impl/ShellImpl.java

@@ -227,7 +227,7 @@ public class ShellImpl implements Shell {
         return currentForegroundJob;
     }
 
-    private class ShellJobHandler implements JobListener {
+    private static class ShellJobHandler implements JobListener {
         ShellImpl shell;
 
         public ShellJobHandler(ShellImpl shell) {

core/src/main/java/com/taobao/arthas/core/shell/term/impl/http/api/HttpApiHandler.java

@@ -658,7 +658,7 @@ public class HttpApiHandler {
         }
     }
 
-    private class ApiTerm implements Term {
+    private static class ApiTerm implements Term {
 
         private Session session;
 

tunnel-client/src/main/java/com/alibaba/arthas/tunnel/client/ProxyClient.java

@@ -103,7 +103,7 @@ public class ProxyClient {
         return httpResponse;
     }
 
-    class HttpProxyClientHandler extends SimpleChannelInboundHandler<HttpObject> {
+    static class HttpProxyClientHandler extends SimpleChannelInboundHandler<HttpObject> {
 
         private Promise<SimpleHttpResponse> promise;