fix(telegraf): Update image default image tag in manifests

Author: Jonathan Chauncey

telegraf/manifests/deis-monitor-telegraf-daemon.yaml

@@ -14,7 +14,7 @@ spec:
       serviceAccount: deis-monitor-telegraf
       containers:
         - name: deis-monitor-telegraf
-          image: quay.io/deis/telegraf:v2-beta
+          image: quay.io/deis/telegraf:canary
           imagePullPolicy: Always
           env:
           - name: POD_NAMESPACE