polishing

Reorganized class structure to match our code style (setter for
properties at the top of the class, public method before private
implementation).

Removed DisposableBean as it the lifecycle is already taking care
of removing MBeans on stop.

Cleaned test suite

Issue: SPR-8045

spring-context/src/test/resources/org/springframework/jmx/export/autodetectNoAutoStartup.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<beans xmlns="http://www.springframework.org/schema/beans"
+	   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	   xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
+
+	<bean id="server" class="org.springframework.jmx.support.MBeanServerFactoryBean"/>
+
+	<bean id="exporter" class="org.springframework.jmx.export.MBeanExporter">
+		<property name="server" ref="server"/>
+		<property name="autodetect" value="true"/>
+		<property name="autoStartup"  value="false"/>
+	</bean>
+
+	<bean name="spring:mbean=true" class="org.springframework.jmx.export.TestDynamicMBean"/>
+
+
+</beans>