[MPOM-50] configure site staging for multi-modules

git-svn-id: https://svn.apache.org/repos/asf/maven/pom/trunk@1586968 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/maven/pom.xml b/maven/pom.xml
index 6808049..0fc7588 100644
--- a/maven/pom.xml
+++ b/maven/pom.xml
@@ -855,6 +855,14 @@
         </plugin>
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-site-plugin</artifactId>
+          <configuration>
+            <!-- for multi-modules site staging -->
+            <topSiteURL>scm:svn:https://svn.apache.org/repos/infra/websites/production/maven/content/${maven.site.path}</topSiteURL>
+          </configuration>
+        </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-scm-publish-plugin</artifactId>
           <configuration>
             <checkoutDirectory>${maven.site.cache}/${maven.site.path}</checkoutDirectory>