Enable honor_labels

We have to enable honor_labels to avoid label duplication

Change-Id: I496f62f1aabc8476a4db8449010b87134cfa5cb2
Related-Bug: PROD-19209
diff --git a/telegraf/meta/prometheus.yml b/telegraf/meta/prometheus.yml
index 5d1d57e..66e6b67 100644
--- a/telegraf/meta/prometheus.yml
+++ b/telegraf/meta/prometheus.yml
@@ -28,4 +28,5 @@
             replacement: {{ grains['host'] }}
             source_labels: "__address__"
             target_label: "host"
+        honor_labels: true
 {%- endif %}