Config: no need to set default=None

By default oslo.cfg sets the default value as None. There is no
need to explicitly do this.

TrivialFix

Change-Id: Icba893180617ab03e42b477706ce089cc5c5b5d1

keystonemiddleware/audit.py

@@ -61,18 +61,15 @@ AUDIT_MIDDLEWARE_GROUP = 'audit_middleware_notifications'
 
 _AUDIT_OPTS = [
     cfg.StrOpt('driver',
-               default=None,
                help='The Driver to handle sending notifications. Possible '
                     'values are messaging, messagingv2, routing, log, test, '
                     'noop. If not specified, then value from '
                     'oslo_messaging_notifications conf section is used.'),
     cfg.ListOpt('topics',
-                default=None,
                 help='List of AMQP topics used for OpenStack notifications. If'
                      ' not specified, then value from '
                      ' oslo_messaging_notifications conf section is used.'),
     cfg.StrOpt('transport_url',
-               default=None,
                secret=True,
                help='A URL representing messaging driver to use for '
                     'notification. If not specified, we fall back to the same '

keystonemiddleware/auth_token/_auth.py

@@ -163,7 +163,6 @@ OPTS = [
                help='Protocol of the admin Identity API endpoint. '
                     'Deprecated, use identity_uri.'),
     cfg.StrOpt('identity_uri',
-               default=None,
                help='Complete admin Identity API endpoint. This '
                     'should specify the unversioned root endpoint '
                     'e.g. https://localhost:35357/'),

keystonemiddleware/auth_token/_opts.py

@@ -29,7 +29,6 @@ from keystonemiddleware.auth_token import _base
 
 _OPTS = [
     cfg.StrOpt('auth_uri',
-               default=None,
                # FIXME(dolph): should be default='http://127.0.0.1:5000/v2.0/',
                # or (depending on client support) an unversioned, publicly
                # accessible identity endpoint (see bug 1207517). Further, we
@@ -49,7 +48,6 @@ _OPTS = [
                ' for validating tokens, because normal end users may not be '
                ' able to reach that endpoint.'),
     cfg.StrOpt('auth_version',
-               default=None,
                help='API version of the admin Identity API endpoint.'),
     cfg.BoolOpt('delay_auth_decision',
                 default=False,
@@ -57,7 +55,6 @@ _OPTS = [
                 ' middleware, but delegate the authorization decision to'
                 ' downstream WSGI components.'),
     cfg.IntOpt('http_connect_timeout',
-               default=None,
                help='Request timeout value for communicating with Identity'
                ' API server.'),
     cfg.IntOpt('http_request_max_retries',
@@ -65,17 +62,16 @@ _OPTS = [
                help='How many times are we trying to reconnect when'
                ' communicating with Identity API Server.'),
     cfg.StrOpt('cache',
-               default=None,
                help='Env key for the swift cache.'),
     cfg.StrOpt('certfile',
                help='Required if identity server requires client certificate'),
     cfg.StrOpt('keyfile',
                help='Required if identity server requires client certificate'),
-    cfg.StrOpt('cafile', default=None,
+    cfg.StrOpt('cafile',
                help='A PEM encoded Certificate Authority to use when '
                     'verifying HTTPs connections. Defaults to system CAs.'),
     cfg.BoolOpt('insecure', default=False, help='Verify HTTPS connections.'),
-    cfg.StrOpt('region_name', default=None,
+    cfg.StrOpt('region_name',
                help='The region in which the identity server can be found.'),
     cfg.StrOpt('signing_dir',
                help='Directory used to cache files related to PKI tokens.'),
@@ -108,7 +104,6 @@ _OPTS = [
                ' cache. If the value is not one of these options or empty,'
                ' auth_token will raise an exception on initialization.'),
     cfg.StrOpt('memcache_secret_key',
-               default=None,
                secret=True,
                help='(Optional, mandatory if memcache_security_strategy is'
                ' defined) This string is used for key derivation.'),