Remove leftover of ceilometer-api support

Change-Id: I844c630235b76e6e1c6de20bf0ccfd2d3148f994

releasenotes/notes/cleanup-ceilometer-api-b16cf4a959ab7232.yaml

@@ -0,0 +1,5 @@
+---
+upgrade:
+  - |
+    The ``[root_cause_analysis_service] ceilometer_version`` option has been
+    removed.

vitrage_tempest_plugin/config.py

@@ -37,7 +37,6 @@ RcaServiceGroup = [
                help='Time to wait between subsequent datasource snapshots'),
     cfg.IntOpt('zabbix_alarms_per_host', default=2),
     cfg.StrOpt('aodh_version', default='2', help='Aodh version'),
-    cfg.StrOpt('ceilometer_version', default='2', help='Ceilometer version'),
     cfg.StrOpt('nova_version', default='2.11', help='Nova version'),
     cfg.StrOpt('cinder_version', default='3', help='Cinder version'),
     cfg.StrOpt('glance_version', default='2', help='Glance version'),

vitrage_tempest_plugin/tests/common/tempest_clients.py

@@ -25,7 +25,6 @@ CONF = config.CONF
 
 _client_modules = {
     'aodh': 'aodhclient.client',
-    'ceilometer': 'ceilometerclient.client',
     'nova': 'novaclient.client',
     'cinder': 'cinderclient.client',
     'glance': 'glanceclient.client',
@@ -48,7 +47,6 @@ class TempestClients(object):
     def class_init(cls, creds):
         cls.creds = creds
         cls._vitrage = None
-        cls._ceilometer = None
         cls._nova = None
         cls._cinder = None
         cls._glance = None
@@ -84,21 +82,6 @@ class TempestClients(object):
         session = cls._get_session_for_user()
         return neutron_client.Client(session=session)
 
-    @classmethod
-    def ceilometer(cls):
-        """ceilometer client
-
-        :rtype: ceilometerclient.v2.client.Client
-        """
-        if not cls._ceilometer:
-            cm_client = driver_module('ceilometer')
-            client = cm_client.get_client(
-                version=CONF.root_cause_analysis_service.ceilometer_version,
-                session=cls._get_session_for_admin(),
-            )
-            cls._ceilometer = client
-        return cls._ceilometer
-
     @classmethod
     def nova(cls):
         """nova client