max-values-per-tag error prints tag key twice

[kostasb]

v1.1RC2

The error message for max-values-per-tag limit prints the tag key twice, instead of tag key and tag value:

2016/11/14 01:06:09 process write shard error: write shard 5141: max-values-per-tag limit exceeded (100000/100000): measurement="mname" tag="tagname" value="tagname" dropped=1

measurement=%q tag=%q value=%q", n, s.options.Config.MaxValuesPerTag, m.Name, string(tag.Key), string(tag.Key))

https://github.com/influxdata/influxdb/blob/master/tsdb/shard.go#L516