obsmarker: write a message with the number of markers added through bundle2

mercurial/bundle2.py

@@ -904,4 +904,6 b' def handlepushkeyreply(op, inpart):'
 def handleobsmarker(op, inpart):
     """add a stream of obsmarkers to the repo"""
     tr = op.gettransaction()
-    op.repo.obsstore.mergemarkers(tr, inpart.read())
+    new = op.repo.obsstore.mergemarkers(tr, inpart.read())
+    if new:
+        op.repo.ui.status(_('%i new obsolescence markers\n') % new)