Added schema version to test XML config file

This commit adds an explicit version to the updated XML configuration
file in order to avoid build errors in IntelliJ IDEA 12.

spring-test/src/test/java/org/springframework/test/context/junit4/aci/xml/MultipleInitializersXmlConfigTests-context.xml

@@ -1,6 +1,6 @@
 <?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">
+	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd">
 
 	<bean id="foo" class="java.lang.String">
 		<constructor-arg value="foo" />