Fix varnish plugin to use default values

closes #1752

CHANGELOG.md

@@ -32,6 +32,7 @@
 - [#1764](https://github.com/influxdata/telegraf/issues/1764): Fix kafka consumer panic when nil error is returned down errs channel.
 - [#1768](https://github.com/influxdata/telegraf/pull/1768): Speed up statsd parsing.
 - [#1751](https://github.com/influxdata/telegraf/issues/1751): Fix powerdns integer parse error handling.
+- [#1752](https://github.com/influxdata/telegraf/issues/1752): Fix varnish plugin defaults not being used.
 
 ## v1.0.1 [unreleased]
 

plugins/inputs/varnish/varnish.go

@@ -146,7 +146,9 @@ func (s *Varnish) Gather(acc telegraf.Accumulator) error {
 func init() {
 	inputs.Add("varnish", func() telegraf.Input {
 		return &Varnish{
-			run: varnishRunner,
+			run:    varnishRunner,
+			Stats:  defaultStats,
+			Binary: defaultBinary,
 		}
 	})
 }