Update xsite plugin and its dependency to xstream.

Author: joehni

pom.xml

@@ -859,6 +859,13 @@
           <groupId>org.codehaus.xsite</groupId>
           <artifactId>xsite-maven-plugin</artifactId>
           <version>${version.plugin.codehaus.xsite}</version>
+          <dependencies>
+            <dependency>
+                <groupId>com.thoughtworks.xstream</groupId>
+                <artifactId>xstream</artifactId>
+                <version>1.4.11.1</version>
+            </dependency>
+          </dependencies>
         </plugin>
         <plugin>
           <groupId>org.apache.felix</groupId>