Batch update project.config on group renames

When a group is renamed through the web UI, each project.config
(and corresponding groups file) is updated with the new name if
there is a permission rule referencing the group.  This ensures
authorship of the relevant modification is charged back to the
user that modified the group name.

Change-Id: Ic44c46553b34548e792269e6ce835ecffea42db7
Signed-off-by: Shawn O. Pearce <sop@google.com>

gerrit-server/src/main/java/com/google/gerrit/server/git/GitModule.java

@@ -20,6 +20,7 @@ import com.google.gerrit.server.config.FactoryModule;
 public class GitModule extends FactoryModule {
   @Override
   protected void configure() {
+    factory(RenameGroupOp.Factory.class);
     factory(MetaDataUpdate.InternalFactory.class);
     bind(MetaDataUpdate.Server.class);
   }