Fixing consul with multiple health checks per service (#1994)

* plugins/input/consul: moved check_id from regular fields to tags.

When service has more than one check sending data for both would overwrite each other
resulting only in one check being written (the last one). Adding check_id as a tag
ensures we will get info for all unique checks per service.

* plugins/inputs/consul: updated tests

plugins/inputs/consul/consul.go

@@ -95,13 +95,13 @@ func (c *Consul) GatherHealthCheck(acc telegraf.Accumulator, checks []*api.Healt
 		record := make(map[string]interface{})
 		tags := make(map[string]string)
 
-		record["check_id"] = check.CheckID
 		record["check_name"] = check.Name
 		record["service_id"] = check.ServiceID
 		record["status"] = check.Status
 
 		tags["node"] = check.Node
 		tags["service_name"] = check.ServiceName
+		tags["check_id"] = check.CheckID
 
 		acc.AddFields("consul_health_checks", record, tags)
 	}