prep for Europa update site

org.eclipse.wtp.releng.webupdatesite/WebContent/site.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <site
-    digestURL="http://download.eclipse.org/webtools/testUpdates/"
-    mirrorsURL="http://www.eclipse.org/downloads/download.php?file=/webtools/testUpdates/site.xml&amp;format=xml"
+    digestURL="http://download.eclipse.org/webtools/updates/"
+    mirrorsURL="http://www.eclipse.org/downloads/download.php?file=/webtools/updates/site.xml&amp;format=xml"
     pack200="true">
     <description
         url="http://download.eclipse.org/webtools/updates/index.html"> The update site contains the features of the of Eclipse Web