Support for Jmx (and Integration) autoconfig in parent contexts

When there are parent contexts we already had a strategy for registering
the actuator endpoints, but not the regular JMX or Integration MBeans.
This chnage makes the autoconfigs for JMX aware of the parent context.

Also adds a sample with a parent context.

See gh-847

spring-boot-samples/spring-boot-sample-parent-context/src/test/java/sample/parent/producer/ProducerApplication.java

@@ -0,0 +1,47 @@
+/*
+ * Copyright 2012-2013 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package sample.parent.producer;
+
+import java.io.File;
+import java.io.FileOutputStream;
+
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.boot.SpringApplication;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class ProducerApplication implements CommandLineRunner {
+
+	@Override
+	public void run(String... args) throws Exception {
+		new File("target/input").mkdirs();
+		if (args.length > 0) {
+			FileOutputStream stream = new FileOutputStream("target/input/data"
+					+ System.currentTimeMillis() + ".txt");
+			for (String arg : args) {
+				stream.write(arg.getBytes());
+			}
+			stream.flush();
+			stream.close();
+		}
+	}
+
+	public static void main(String[] args) throws Exception {
+		SpringApplication.run(ProducerApplication.class, args);
+	}
+
+}