SHL-15 change plugin module by using XML

samples/helloworld/src/main/resources/META-INF/spring/spring-shell-plugin.xml

@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<plugin>
-  <configuration>
-    <class>org.springframework.shell.samples.helloworld.HelloWorldPlugin</class>
-  </configuration>
-</plugin>

samples/helloworld/src/main/resources/spring-shell-beans.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<beans xmlns="http://www.springframework.org/schema/beans"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xmlns:context="http://www.springframework.org/schema/context"
+	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
+		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd">
+
+	<context:component-scan base-package="org.springframework.shell.samples.helloworld.commands" />
+
+</beans>