fix(setting): honor bare -1 for timeout settings (#39181)

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

modules/setting/config_provider_test.go

@@ -6,6 +6,7 @@ package setting
 import (
 	"os"
 	"testing"
+	"time"
 
 	"github.com/stretchr/testify/assert"
 )
@@ -136,3 +137,15 @@ func TestDisableSaving(t *testing.T) {
 	assert.NoError(t, err)
 	assert.Equal(t, "k1 = a\nk2 = y\nk3 = z\n", string(bs))
 }
+
+func TestConfigValueRead(t *testing.T) {
+	cfg, _ := NewConfigProviderFromData(`
+neg = -1
+zero = 0
+hour = 1h
+`)
+	assert.Equal(t, -1*time.Second, cfg.Section("").Key("neg").MustDuration(9999))
+	assert.EqualValues(t, 0, cfg.Section("").Key("zero").MustDuration(9999))
+	assert.Equal(t, time.Hour, cfg.Section("").Key("hour").MustDuration(9999))
+	assert.Equal(t, time.Duration(9999), cfg.Section("").Key("def").MustDuration(9999))
+}