Support older notifications set_override keys

Neutron and Ceilometer use set_override to set
the older deprecated key. We should support them
using the ConfFixture

Closes-Bug: #1521776
Change-Id: I2bd77284f80bc4525f062f313b1ec74f2b54b395

oslo_messaging/conffixture.py

@@ -18,6 +18,7 @@ __all__ = ['ConfFixture']
 import sys
 
 import fixtures
+from functools import wraps
 
 
 def _import_opts(conf, module, opts, group=None):
@@ -70,6 +71,24 @@ class ConfFixture(fixtures.Fixture):
                      '_notifier_opts',
                      'oslo_messaging_notifications')
 
+        # Support older test cases that still use the set_override
+        # with the old config key names
+        def decorator_for_set_override(wrapped_function):
+            @wraps(wrapped_function)
+            def _wrapper(*args, **kwargs):
+                group = 'oslo_messaging_notifications'
+                if args[0] == 'notification_driver':
+                    args = ('driver', args[1], group)
+                elif args[0] == 'notification_transport_url':
+                    args = ('transport_url', args[1], group)
+                elif args[0] == 'notification_topics':
+                    args = ('topics', args[1], group)
+                return wrapped_function(*args, **kwargs)
+            return _wrapper
+
+        self.conf.set_override = decorator_for_set_override(
+            self.conf.set_override)
+
     def setUp(self):
         super(ConfFixture, self).setUp()
         self.addCleanup(self.conf.reset)