Fix Jetty's p2 repository URL

The Jetty 7.x p2 repository was moved to the archive server

Change-Id: If864c64e8a64ced9b9b982332b412b367a6c1011
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit.packaging/pom.xml

@@ -85,7 +85,7 @@
     <repository>
       <id>jetty</id>
       <layout>p2</layout>
-      <url>http://download.eclipse.org/jetty/updates/jetty-bundles-7.x/${jetty-version}/</url>
+      <url>http://archive.eclipse.org/jetty/updates/jetty-bundles-7.x/${jetty-version}/</url>
     </repository>
     <repository>
       <id>orbit</id>