Fixed logs aggregation rule

Change-Id: Iae3492ab06d8da041739bcfb794b5218dad43d54
diff --git a/heat/meta/heka.yml b/heat/meta/heka.yml
index 431b693..127924c 100644
--- a/heat/meta/heka.yml
+++ b/heat/meta/heka.yml
@@ -120,7 +120,7 @@
 aggregator:
   alarm_cluster:
     heat_logs:
-      policy: highest_severity
+      policy: status_of_members
       alerting: enabled
       group_by: hostname
       match: