Update gonx to support variables with uppercase letters about honeytail HOT 1 CLOSED

func TestProcessLines(t *testing.T) {
	t1, _ := time.ParseInLocation(commonLogFormatTimeLayout, "08/Oct/2015:00:26:26 -0000", time.UTC)
	preReg := &parsers.ExtRegexp{regexp.MustCompile("^.*:..:.. (?P<pre_hostname>[a-zA-Z-.]+): ")}
	tlm := []testLineMaps{
		{
			line:        "Nov 05 10:23:45 myhost: https - 10.252.4.24 - - [08/Oct/2015:00:26:26 +0000] 200 174 0.099 a873d74c-4588-4a25-b3ed-77d23fe6275a 17d22fa7-796e-85f6-3d58-2d6e693da860",
			trimmedLine: "https - 10.252.4.24 - - [08/Oct/2015:00:26:26 +0000] 200 174 0.099 a873d74c-4588-4a25-b3ed-77d23fe6275a 17d22fa7-796e-85f6-3d58-2d6e693da860",
			ev: event.Event{
				Timestamp: t1,
				Data: map[string]interface{}{
					"pre_hostname":           "myhost",
					"body_bytes_sent":        int64(174),
					"http_x_forwarded_proto": "https",
					"remote_addr":            "10.252.4.24",
					"request_time":           0.099,
					"status":                 int64(200),
					"traceId":                "a873d74c-4588-4a25-b3ed-77d23fe6275a",
					"id":                     "17d22fa7-796e-85f6-3d58-2d6e693da860",
				},
			},
		},
	}
	p := &Parser{
		conf: Options{
			NumParsers: 5,
		},
		lineParser: &GonxLineParser{
			parser: gonx.NewParser("$http_x_forwarded_proto - $remote_addr - $remote_user [$time_local] $status $body_bytes_sent $request_time $traceId $id"),
		},
	}
	lines := make(chan string)
	send := make(chan event.Event)
	go func() {
		for _, pair := range tlm {
			lines <- pair.line
		}
		close(lines)
	}()
	go p.ProcessLines(lines, send, preReg)
	for _, pair := range tlm {
		resp := <-send
		if !reflect.DeepEqual(resp, pair.ev) {
			t.Fatalf("line resp didn't match up for %s. Expected: %+v, actual: %+v",
				pair.line, pair.ev, resp)
		}
	}
}