knock more errors from test files

plugins/parsers/grok/parser_test.go

@@ -12,7 +12,6 @@ func TestGrokParse(t *testing.T) {
 		Measurement: "t_met",
 		Patterns:    []string{"%{COMMON_LOG_FORMAT}"},
 	}
-	//var acc testutil.Accumulator
 	parser.Compile()
 	metrics, err := parser.Parse([]byte(`127.0.0.1 user-identifier frank [10/Oct/2000:13:55:36 -0700] "GET /apache_pb.gif HTTP/1.0" 200 2326`))
 	log.Printf("metric_tags: %v, metric_fields: %v", metrics[0].Tags(), metrics[0].Fields())