Add process checks for Ceilometer

Process checks for Ceilometer.

Regarding ceilometer-agent-central, the actual process name in this
case appears to be 'ceilometer-polling', hence the replacement.

Change-Id: I282217454a51d49a1ae34770af5b023a9ed307a9
diff --git a/metadata/service/support.yml b/metadata/service/support.yml
index 556e589..24f09b4 100644
--- a/metadata/service/support.yml
+++ b/metadata/service/support.yml
@@ -2,7 +2,7 @@
   ceilometer:
     _support:
       collectd:
-        enabled: false
+        enabled: true
       heka:
         enabled: true
       sensu: