fix code style

Author: huicunjun

test/plugin/scenarios/grpc-scenario/src/main/java/org/apache/skywalking/apm/testcase/grpc/controller/CaseController.java

@@ -37,7 +37,6 @@
 import org.apache.skywalking.apm.testcase.grpc.proto.GreeterGrpc;
 import org.apache.skywalking.apm.testcase.grpc.proto.HelloRequest;
 import org.apache.skywalking.apm.testcase.grpc.proto.HelloReply;
-import org.springframework.cglib.core.ReflectUtils;
 import org.springframework.util.ReflectionUtils;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.ResponseBody;