Remove the usage of down and disabled together

This patch removes the trigger with state '== down || == disabled'
because it is not working as expected. Instead we ensure that it
triggers only if only one agent is up and at least another one isn't up.

Change-Id: I4e64e4302bd4780401fb1c90b1dc8eeb3d3f9e05
diff --git a/neutron/meta/heka.yml b/neutron/meta/heka.yml
index 6778821..422ff50 100644
--- a/neutron/meta/heka.yml
+++ b/neutron/meta/heka.yml
@@ -124,12 +124,12 @@
         window: 60
         periods: 0
         function: last
-      - metric: openstack_neutron_agents
+      - metric: openstack_neutron_agents_percent
         field:
           service: {{ agent }}
-          state: '== down || == disabled'
-        relational_operator: '>'
-        threshold: 0
+          state: up
+        relational_operator: '<'
+        threshold: 100
         window: 60
         periods: 0
         function: last