weaken label for negative review feedback

Rejected was quite strong. In case changes are really rejected, it
is sufficient to comment and close the MR. There is no need to label
those MR as rejected. In case the MR needs some more work from the
developer the label 'review-postponed' should be added.


Former-commit-id: 69277c8b

CI/handle_new_mr.py

@@ -79,7 +79,7 @@ def add_labels(mr,domains):
     for d in domains:
         labels.add(d)
     # remove possible complete review labels
-    for l in ["review-approved","review-rejected","2nd-level-pending","expert-pending"]:
+    for l in ["review-approved","review-postponed","2nd-level-pending","expert-pending"]:
         labels.discard(l)
     # add review-pending flag
     labels.add("review-pending")