Add value-type attrib to beans->map->entry element

Previously, the <value> subelement of a map <entry> allowed one to
specify the type of a specific map entry value. This patch allows a
value-type attribute as well, such that instead of the following
syntax

    <entry key="x-message-ttl">
        <value type="java.lang.Long">100</value>
    </entry>
    <entry key="x-ha-policy" value="all" />

one can now use the more concise form

    <entry key="x-message-ttl" value="100" value-type="java.lang.Long"/>
    <entry key="x-ha-policy" value="all"/>

The new value-type attribute may be used at the <map> level as well,
indicating that all elements are of the same type.

Appropriate tests have been added exercising value-type at the <map> and
<entry> levels.

Issue: SPR-9249

spring-beans/src/test/resources/org/springframework/beans/factory/xml/collections.xml

@@ -1,7 +1,7 @@
 <?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-3.0.xsd">
+		xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd">
 
 	<bean id="jenny" class="test.beans.TestBean">	
 		<property name="name"><value>Jenny</value></property>
@@ -133,7 +133,7 @@
 
 	<bean id="mixedMap" class="org.springframework.beans.factory.xml.HasMap">
 		<property name="map">
-			<map>
+			<map value-type="java.lang.Integer">
 				<entry key-ref="fooKey">
 					<value type="java.lang.Integer">10</value>
 				</entry>
@@ -151,6 +151,8 @@
 					</key>
 					<idref bean="david"/>
 				</entry>
+				<entry key="bar" value="100" value-type="java.lang.Long"/>
+				<entry key="baz" value="200"/>
 			</map>
 		</property>
 	</bean>