Split between local and remote Telegraf agents

The remote agent is now in charge of collecting the cluster health
metrics. This makes the alerting rules on cluster health more robust
because they don't have to aggregate metrics anumore.

Change-Id: I1dcd1801038e5e580402a70fb9325f39fac02c85
Depends-On: I473a916178ec4f9ea44951975f55fff5ee68e687
3 files changed