Add watchdog for Heka services

This patch adds a new 'heka.sandbox.watchdog' type of Heka message that
is used by Sensu to check the availability of a service. In the current
implementation the message is issued by a filter for all Heka services
and the check is sent locally to the Sensu client.

Change-Id: I6b3c9d808dcec7d8c15c442390dfbda2032f38ce
diff --git a/metadata/service/aggregator/output/sensu.yml b/metadata/service/aggregator/output/sensu.yml
index bd5e55a..394acb6 100644
--- a/metadata/service/aggregator/output/sensu.yml
+++ b/metadata/service/aggregator/output/sensu.yml
@@ -2,4 +2,4 @@
   heka:
     aggregator:
       sensu_source_dimension_key: nagios_host
-      sensu_host: 127.0.0.1
\ No newline at end of file
+      sensu_host: 127.0.0.1
diff --git a/metadata/service/ceilometer_collector/output/sensu.yml b/metadata/service/ceilometer_collector/output/sensu.yml
new file mode 100644
index 0000000..488b481
--- /dev/null
+++ b/metadata/service/ceilometer_collector/output/sensu.yml
@@ -0,0 +1,4 @@
+parameters:
+  heka:
+    ceilometer_collector:
+      sensu_host: 127.0.0.1
diff --git a/metadata/service/log_collector/output/sensu.yml b/metadata/service/log_collector/output/sensu.yml
new file mode 100644
index 0000000..e2e5379
--- /dev/null
+++ b/metadata/service/log_collector/output/sensu.yml
@@ -0,0 +1,4 @@
+parameters:
+  heka:
+    log_collector:
+      sensu_host: 127.0.0.1
diff --git a/metadata/service/metric_collector/output/sensu.yml b/metadata/service/metric_collector/output/sensu.yml
new file mode 100644
index 0000000..7e86605
--- /dev/null
+++ b/metadata/service/metric_collector/output/sensu.yml
@@ -0,0 +1,4 @@
+parameters:
+  heka:
+    metric_collector:
+      sensu_host: 127.0.0.1
diff --git a/metadata/service/remote_collector/output/sensu.yml b/metadata/service/remote_collector/output/sensu.yml
new file mode 100644
index 0000000..3906916
--- /dev/null
+++ b/metadata/service/remote_collector/output/sensu.yml
@@ -0,0 +1,4 @@
+parameters:
+  heka:
+    remote_collector:
+      sensu_host: 127.0.0.1