Reduce need for bean method proxying and disable where not needed

Closes gh-9068

spring-boot-samples/spring-boot-sample-atmosphere/src/main/java/sample/atmosphere/SampleAtmosphereApplication.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -65,7 +65,7 @@ public class SampleAtmosphereApplication {
 		SpringApplication.run(SampleAtmosphereApplication.class, args);
 	}
 
-	@Configuration
+	@Configuration(proxyBeanMethods = false)
 	static class MvcConfiguration implements WebMvcConfigurer {
 
 		@Override