Allow wildcards for Varnish stats

[joshuaspence]

#1173 added a varnish plugin, which is awesome. The default stats collected are ["MAIN.cache_hit", "MAIN.cache_miss", "MAIN.uptime"]. I want to collect as many stats as possible, so I set this config to ["all"]. This seems to cause some issues though:

> telegraf -input-filter varnish -test
2016/05/25 19:01:47 Using config file: /etc/telegraf/telegraf.conf
* Plugin: varnish, Collection 1
Expected a numeric value for VBE.READACTED(X.X.X.X,,80).happy = 18446744073709551615
Expected a numeric value for VBE.READACTED(X.X.X.X,,80).happy = 18446744073709551615
Expected a numeric value for VBE.READACTED(X.X.X.X,,80).happy = 18446744073709551615
Expected a numeric value for VBE.READACTED(X.X.X.X,,80).happy = 18446744073709551615
Expected a numeric value for VBE.READACTED(X.X.X.X,,80).happy = 18446744073709551615
Expected a numeric value for VBE.READACTED(X.X.X.X,,80).happy = 18446744073709551615
Expected a numeric value for VBE.READACTED(X.X.X.X,,80).happy = 18446744073709551615
Expected a numeric value for VBE.READACTED(X.X.X.X,,80).happy = 18446744073709551615
Expected a numeric value for VBE.READACTED(X.X.X.X,,80).happy = 18446744073709551615
Expected a numeric value for VBE.READACTED(X.X.X.X,,80).happy = 18446744073709551615
Expected a numeric value for VBE.READACTED(X.X.X.X,,80).happy = 18446744073709551615
Expected a numeric value for VBE.READACTED(X.X.X.X,,80).happy = 18446744073709551615
Expected a numeric value for VBE.READACTED(X.X.X.X,,80).happy = 18446744073709551615
Expected a numeric value for VBE.READACTED(X.X.X.X,,80).happy = 18446744073709551615
Expected a numeric value for VBE.READACTED(X.X.X.X,,80).happy = 18446744073709551615
Expected a numeric value for VBE.READACTED(X.X.X.X,,80).happy = 18446744073709551615
Expected a numeric value for VBE.READACTED(X.X.X.X,,80).happy = 18446744073709551615
Expected a numeric value for VBE.READACTED(X.X.X.X,,80).happy = 18446744073709551615
Expected a numeric value for VBE.READACTED(X.X.X.X,,80).happy = 18446744073709551615
Expected a numeric value for VBE.READACTED(X.X.X.X,,80).happy = 18446744073709551615
Expected a numeric value for VBE.READACTED(X.X.X.X,,80).happy = 18446744073709551615
Expected a numeric value for VBE.READACTED(X.X.X.X,,80).happy = 18446744073709551615
Expected a numeric value for VBE.READACTED(X.X.X.X,,80).happy = 18446744073709551615
Expected a numeric value for VBE.READACTED(X.X.X.X,,80).happy = 18446744073709551615
Expected a numeric value for VBE.READACTED(X.X.X.X,,80).happy = 18446744073709551615
Expected a numeric value for VBE.READACTED(X.X.X.X,,80).happy = 18446744073709551615
Expected a numeric value for VBE.READACTED(X.X.X.X,,80).happy = 18446744073709551615
Expected a numeric value for VBE.READACTED(X.X.X.X,,80).happy = 18446744073709551615
Expected a numeric value for VBE.READACTED(X.X.X.X,,80).happy = 18446744073709551615
Expected a numeric value for VBE.READACTED(X.X.X.X,,80).happy = 18446744073709551615
Expected a numeric value for VBE.READACTED(X.X.X.X,,80).happy = 18446744073709551615
Expected a numeric value for VBE.READACTED(X.X.X.X,,80).happy = 18446744073709551615
Expected a numeric value for VBE.READACTED(X.X.X.X,,80).happy = 18446744073709551615
...

Instead, I was going to try collecting ["MAIN.*"], but the plugin doesn't seem to support wildcards.

[ljagiello]

Wildcards would be really great (I think I fix that), the problem you show in output (Expected a numeric value…) is connected metrics type - it's int and should be uint64 (fixed here: #1276)