Merge from oslo-incubator for notifier

Goal: merge from oslo-incubator change  I282d4ae3311bc3fcda6be8e5a1fceecfc8ddb115

Done via:
python update.py --nodeps --base nova --dest-dir ../nova --modules notifier

Change-Id: I5ed80458f1073d6e5185e2769eed85a49dec5d10

nova/openstack/common/notifier/api.py

@@ -19,7 +19,7 @@ import uuid
 from oslo.config import cfg
 
 from nova.openstack.common import context
-from nova.openstack.common.gettextutils import _
+from nova.openstack.common.gettextutils import _  # noqa
 from nova.openstack.common import importutils
 from nova.openstack.common import jsonutils
 from nova.openstack.common import log as logging
@@ -157,17 +157,6 @@ def _get_drivers():
     if _drivers is None:
         _drivers = {}
         for notification_driver in CONF.notification_driver:
-            add_driver(notification_driver)
-
-    return _drivers.values()
-
-
-def add_driver(notification_driver):
-    """Add a notification driver at runtime."""
-    # Make sure the driver list is initialized.
-    _get_drivers()
-    if isinstance(notification_driver, basestring):
-        # Load and add
             try:
                 driver = importutils.import_module(notification_driver)
                 _drivers[notification_driver] = driver
@@ -175,9 +164,7 @@ def add_driver(notification_driver):
                 LOG.exception(_("Failed to load notifier %s. "
                                 "These notifications will not be sent.") %
                               notification_driver)
-    else:
+    return _drivers.values()
-        # Driver is already loaded; just add the object.
-        _drivers[notification_driver] = notification_driver
 
 
 def _reset_drivers():

nova/openstack/common/notifier/log_notifier.py

@@ -25,7 +25,7 @@ CONF = cfg.CONF
 def notify(_context, message):
     """Notifies the recipient of the desired event given the model.
 
-    Log notifications using openstack's default logging system.
+    Log notifications using OpenStack's default logging system.
     """
 
     priority = message.get('priority',

nova/openstack/common/notifier/rpc_notifier.py

@@ -16,7 +16,7 @@
 from oslo.config import cfg
 
 from nova.openstack.common import context as req_context
-from nova.openstack.common.gettextutils import _
+from nova.openstack.common.gettextutils import _  # noqa
 from nova.openstack.common import log as logging
 from nova.openstack.common import rpc
 
@@ -24,7 +24,7 @@ LOG = logging.getLogger(__name__)
 
 notification_topic_opt = cfg.ListOpt(
     'notification_topics', default=['notifications', ],
-    help='AMQP topic used for openstack notifications')
+    help='AMQP topic used for OpenStack notifications')
 
 CONF = cfg.CONF
 CONF.register_opt(notification_topic_opt)

nova/openstack/common/notifier/rpc_notifier2.py

@@ -18,7 +18,7 @@
 from oslo.config import cfg
 
 from nova.openstack.common import context as req_context
-from nova.openstack.common.gettextutils import _
+from nova.openstack.common.gettextutils import _  # noqa
 from nova.openstack.common import log as logging
 from nova.openstack.common import rpc
 
@@ -26,7 +26,7 @@ LOG = logging.getLogger(__name__)
 
 notification_topic_opt = cfg.ListOpt(
     'topics', default=['notifications', ],
-    help='AMQP topic(s) used for openstack notifications')
+    help='AMQP topic(s) used for OpenStack notifications')
 
 opt_group = cfg.OptGroup(name='rpc_notifier2',
                          title='Options for rpc_notifier2')