Suppressed DeprecationWarning during import of ZPublisher.Iterators.

o That module needs to use Z2-style interfaces in 2.11, for BBB, but
  the Interface module itself issues the warning on import.

doc/CHANGES.txt

@@ -8,6 +8,10 @@ Zope Changes
 
     Bugs Fixed
 
+      - Suppressed DeprecationWarning during import of ZPublisher.Iterators:
+        that module needs to use Z2-style interfaces in 2.11, for BBB, but
+        the Interface module itself issues the warning on import.
+
       - Launchpad #246748: added 'immediate' option to sendXXX() methods
         for sending a mail immediately by-passing the zope.sendmail delivery
         mechanism

lib/python/ZPublisher/Iterators.py

-from Interface import Interface
+import warnings
+
+# The Z2 Interface module is deprecated:  in Zope 2.12, this module will use
+# Z3 interfaces instead.  Meanwhile, silence the deprecation warning.
+_existing_filters = warnings.filters[:]
+warnings.filterwarnings('ignore', category=DeprecationWarning)
+try:
+    from Interface import Interface
+finally:
+    warnings.filters[:] = _existing_filters
+    del _existing_filters
 
 class IStreamIterator(Interface):
     """