Remove the usage of down and disabled together

This patch removes the trigger with state '== down || == disabled'
because it is not working. We replaced it by a check that validates the
fact that alarm is triggered only if one service is up and at least
another service is down or disabled by using the percentage of services
up.

Change-Id: Ic4f2e6ea7be9e90a59116b46e3487074a365c8bd
diff --git a/nova/meta/heka.yml b/nova/meta/heka.yml
index c6cd75c..2535ecf 100644
--- a/nova/meta/heka.yml
+++ b/nova/meta/heka.yml
@@ -157,12 +157,12 @@
         window: 60
         periods: 0
         function: last
-      - metric: openstack_nova_services
+      - metric: openstack_nova_services_percent
         field:
           service: {{ nova_service }}
-          state: '== down || == disabled'
-        relational_operator: '>'
-        threshold: 0
+          state: up
+        relational_operator: '<'
+        threshold: 100
         window: 60
         periods: 0
         function: last