remove default=None for config options

In the cfg module default=None is set as the default value.

Change-Id: I2c717e39d7b5d9c80d1e5556f029f6aea0d290fe
Closes-bug: #1323975

aodh/api/controllers/v2/alarms.py

@@ -56,12 +56,10 @@ LOG = log.getLogger(__name__)
 
 ALARM_API_OPTS = [
     cfg.IntOpt('user_alarm_quota',
-               default=None,
                deprecated_group="alarm",
                help='Maximum number of alarms defined for a user.'
                ),
     cfg.IntOpt('project_alarm_quota',
-               default=None,
                deprecated_group="alarm",
                help='Maximum number of alarms defined for a project.'
                ),

aodh/coordination.py

@@ -26,7 +26,6 @@ LOG = log.getLogger(__name__)
 
 OPTS = [
     cfg.StrOpt('backend_url',
-               default=None,
                help='The backend URL to use for distributed coordination. If '
                     'left empty, per-deployment central agent and per-host '
                     'compute agent won\'t do workload '

aodh/storage/__init__.py

@@ -36,7 +36,6 @@ OPTS = [
                      "in the database for (<= 0 means forever).")),
     cfg.StrOpt('alarm_connection',
                secret=True,
-               default=None,
                deprecated_for_removal=True,
                help='The connection string used to connect '
                'to the alarm database - rather use ${database.connection}'),