Update test tiles.xml files to use v3 DTD

Update tiles.xml files used with tests to reference tiles-config_3_0
instead of tiles-config_2_1 DTD.

Prior to this commit tiles based tests would fail when building
offline or behind a proxy server.

spring-test-mvc/src/test/resources/META-INF/web-resources/WEB-INF/layouts/tiles.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE tiles-definitions PUBLIC "-//Apache Software Foundation//DTD Tiles Configuration 2.1//EN" "http://tiles.apache.org/dtds/tiles-config_2_1.dtd">
-
+<!DOCTYPE tiles-definitions PUBLIC "-//Apache Software Foundation//DTD Tiles Configuration 3.0//EN" "http://tiles.apache.org/dtds/tiles-config_3_0.dtd">
 <tiles-definitions>
-
 	<definition name="standardLayout" templateExpression="/WEB-INF/layouts/standardLayout.jsp"/>
-
 </tiles-definitions>

spring-test-mvc/src/test/resources/META-INF/web-resources/WEB-INF/views/tiles.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE tiles-definitions PUBLIC "-//Apache Software Foundation//DTD Tiles Configuration 2.1//EN" "http://tiles.apache.org/dtds/tiles-config_2_1.dtd">
-
+<!DOCTYPE tiles-definitions PUBLIC "-//Apache Software Foundation//DTD Tiles Configuration 3.0//EN" "http://tiles.apache.org/dtds/tiles-config_3_0.dtd">
 <tiles-definitions>
-
-    <definition name="home" extends="standardLayout">
-        <put-attribute name="main" value="/WEB-INF/views/home.jsp" />
-    </definition>
-
+	<definition name="home" extends="standardLayout">
+		<put-attribute name="main" value="/WEB-INF/views/home.jsp" />
+	</definition>
 </tiles-definitions>