Merge branch 'nd/fetch-into-shallow'

When there is no sufficient overlap between old and new history
during a fetch into a shallow repository, we unnecessarily sent
objects the sending side knows the receiving end has.

* nd/fetch-into-shallow:
  Add testcase for needless objects during a shallow fetch
  list-objects: mark more commits as edges in mark_edges_uninteresting
  list-objects: reduce one argument in mark_edges_uninteresting
  upload-pack: delegate rev walking in shallow fetch to pack-objects
  shallow: add setup_temporary_shallow()
  shallow: only add shallow graft points to new shallow file
  move setup_alternate_shallow and write_shallow_commits to shallow.c

http-push.c

@@ -1975,7 +1975,7 @@ int main(int argc, char **argv)
 		pushing = 0;
 		if (prepare_revision_walk(&revs))
 			die("revision walk setup failed");
-		mark_edges_uninteresting(revs.commits, &revs, NULL);
+		mark_edges_uninteresting(&revs, NULL);
 		objects_to_send = get_delta(&revs, ref_lock);
 		finish_all_active_slots();