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: I69adadc2196a119eb0661ae7a7fd6af607e61689

ceilometer/api/controllers/v2/root.py

@@ -36,15 +36,12 @@ from ceilometer import keystone_client
 
 API_OPTS = [
     cfg.BoolOpt('gnocchi_is_enabled',
-                default=None,
                 help=('Set True to disable resource/meter/sample URLs. '
                       'Default autodetection by querying keystone.')),
     cfg.BoolOpt('aodh_is_enabled',
-                default=None,
                 help=('Set True to redirect alarms URLs to aodh. '
                       'Default autodetection by querying keystone.')),
     cfg.StrOpt('aodh_url',
-               default=None,
                help=('The endpoint of Aodh to redirect alarms URLs '
                      'to Aodh API. Default autodetection by querying '
                      'keystone.')),

ceilometer/collector.py

@@ -42,7 +42,6 @@ OPTS = [
                help='Number of notification messages to wait before '
                'dispatching them'),
     cfg.IntOpt('batch_timeout',
-               default=None,
                help='Number of seconds to wait before dispatching samples'
                'when batch_size is not reached (None means indefinitely)'),
 ]

ceilometer/notification.py

@@ -77,7 +77,6 @@ OPTS = [
                help='Number of notification messages to wait before '
                'publishing them'),
     cfg.IntOpt('batch_timeout',
-               default=None,
                help='Number of seconds to wait before publishing samples'
                'when batch_size is not reached (None means indefinitely)'),
 ]