Fix the alarm_cluster for nova services

Change-Id: I5cd1f992632ae17fd1cfbba4e8c51edd7ca39d22
diff --git a/nova/meta/heka.yml b/nova/meta/heka.yml
index de1a869..214ab54 100644
--- a/nova/meta/heka.yml
+++ b/nova/meta/heka.yml
@@ -274,6 +274,7 @@
       dimension:
         service: nova-control
     {%- for nova_service in ('cert', 'consoleauth', 'compute', 'conductor', 'scheduler') %}
+    nova_{{ nova_service }}:
       policy: highest_severity
       match:
         service: nova-{{ nova_service }}