Remove unused methods in alarm manager

Below unused methods are removed -
1. _determine_version_cap definition is unused and there are no
   references to it in the code
2. 'summary' uses invalid decorator -
   @index.when(method='summary', template='json').
3. _get_alarm_summary method was only used by 'summary'
   method which is removed

Test plan:
1. Pass: Run UT coverage with this change.
         Coverage improved from 73% to 97%.
2. Pass: Run 'dcmanager alarm summary' command.
         There is no functional impact.

Story: 2007082
Task: 49564

Change-Id: I552d62a4c160ea52a1d17167d095d569786d254f
Signed-off-by: Susendra Selvaraj <susendra.selvaraj@windriver.com>

distributedcloud/dcmanager/api/controllers/v1/alarm_manager.py

@@ -21,7 +21,6 @@ from pecan import expose
 from dcmanager.api.controllers import restcomm
 from dcmanager.api.policies import alarm_manager as alarm_manager_policy
 from dcmanager.api import policy
-from dcmanager.common import consts
 from dcmanager.db import api as db_api
 
 LOG = logging.getLogger(__name__)
@@ -35,11 +34,6 @@ class SubcloudAlarmController(object):
     def __init__(self, *args, **kwargs):
         super(SubcloudAlarmController, self).__init__(*args, **kwargs)
 
-    # to do the version compatibility for future purpose
-    def _determine_version_cap(self, target):
-        version_cap = 1.0
-        return version_cap
-
     @expose(generic=True, template='json')
     def index(self):
         # Route the request to specific methods with parameters
@@ -68,21 +62,3 @@ class SubcloudAlarmController(object):
         policy.authorize(alarm_manager_policy.POLICY_ROOT % "get", {},
                          restcomm.extract_credentials_for_policy())
         return self._get_alarm_aggregates()
-
-    def _get_alarm_summary(self):
-        alarms = self._get_alarm_aggregates()
-        summary = {consts.ALARM_CRITICAL_STATUS: 0,
-                   consts.ALARM_DEGRADED_STATUS: 0,
-                   consts.ALARM_OK_STATUS: 0}
-        for alarm in alarms['alarm_summary']:
-            summary[alarm['cloud_status']] += 1
-        return summary
-
-    @index.when(method='summary', template='json')
-    def summary(self):
-        """Get an agregate of all subcloud status
-
-        """
-        policy.authorize(alarm_manager_policy.POLICY_ROOT % "get", {},
-                         restcomm.extract_credentials_for_policy())
-        return self._get_alarm_summary()