telemetry: include notification agent in server class

- Include Ceilometer Notification Agent in cloud::telemetry class
- Add tests

manifests/telemetry/server.pp

@@ -38,5 +38,6 @@ class cloud::telemetry::server(
   class { 'cloud::telemetry::alarmevaluator': }
   class { 'cloud::telemetry::alarmnotifier': }
   class { 'cloud::telemetry::collector': }
+  class { 'cloud::telemetry::agent::notification': }
 
 }

spec/classes/cloud_telemetry_server_spec.rb

@@ -70,6 +70,10 @@ describe 'cloud::telemetry::server' do
       should contain_class('ceilometer::collector')
     end
 
+    it 'configure ceilometer notification agent' do
+      should contain_class('ceilometer::agent::notification')
+    end
+
     it 'configure ceilometer alarm evaluator' do
       should contain_class('ceilometer::alarm::evaluator')
     end