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: I57fa9651ea56a180a910d6cbf7b7f385da8af239

oslo_messaging/_drivers/amqp1_driver/opts.py

@@ -32,7 +32,6 @@ amqp1_opts = [
                help="address prefix when sending to any server in group"),
 
     cfg.StrOpt('container_name',
-               default=None,
                deprecated_group='amqp1',
                help='Name for the AMQP container'),
 
@@ -62,7 +61,6 @@ amqp1_opts = [
                help='Private key PEM file used to sign cert_file certificate'),
 
     cfg.StrOpt('ssl_key_password',
-               default=None,
                deprecated_group='amqp1',
                secret=True,
                help='Password for decrypting ssl_key_file (if encrypted)'),

oslo_messaging/_drivers/pika_driver/pika_connection_factory.py

@@ -36,15 +36,15 @@ HOST_CONNECTION_LAST_TRY_TIME = "last_try_time"
 HOST_CONNECTION_LAST_SUCCESS_TRY_TIME = "last_success_try_time"
 
 pika_opts = [
-    cfg.IntOpt('channel_max', default=None,
+    cfg.IntOpt('channel_max',
                help='Maximum number of channels to allow'),
-    cfg.IntOpt('frame_max', default=None,
+    cfg.IntOpt('frame_max',
                help='The maximum byte size for an AMQP frame'),
     cfg.IntOpt('heartbeat_interval', default=3,
                help="How often to send heartbeats for consumer's connections"),
-    cfg.BoolOpt('ssl', default=None,
+    cfg.BoolOpt('ssl',
                 help='Enable SSL'),
-    cfg.DictOpt('ssl_options', default=None,
+    cfg.DictOpt('ssl_options',
                 help='Arguments passed to ssl.wrap_socket'),
     cfg.FloatOpt('socket_timeout', default=0.25,
                  help="Set socket timeout in seconds for connection's socket"),