Refactor the setting to make unit test easier (#22405)

Some bugs caused by less unit tests in fundamental packages. This PR
refactor `setting` package so that create a unit test will be easier
than before.

- All `LoadFromXXX` files has been splited as two functions, one is
`InitProviderFromXXX` and `LoadCommonSettings`. The first functions will
only include the code to create or new a ini file. The second function
will load common settings.
- It also renames all functions in setting from `newXXXService` to
`loadXXXSetting` or `loadXXXFrom` to make the function name less
confusing.
- Move `XORMLog` to `SQLLog` because it's a better name for that.

Maybe we should finally move these `loadXXXSetting` into the `XXXInit`
function? Any idea?

---------

Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: delvh <dev.lh@web.de>

models/asymkey/main_test.go

@@ -13,7 +13,7 @@ import (
 
 func init() {
 	setting.SetCustomPathAndConf("", "", "")
-	setting.LoadForTest()
+	setting.InitProviderAndLoadCommonSettingsForTest()
 }
 
 func TestMain(m *testing.M) {

models/dbfs/main_test.go

@@ -13,7 +13,7 @@ import (
 
 func init() {
 	setting.SetCustomPathAndConf("", "", "")
-	setting.LoadForTest()
+	setting.InitProviderAndLoadCommonSettingsForTest()
 }
 
 func TestMain(m *testing.M) {

models/issues/main_test.go

@@ -20,7 +20,7 @@ import (
 
 func init() {
 	setting.SetCustomPathAndConf("", "", "")
-	setting.LoadForTest()
+	setting.InitProviderAndLoadCommonSettingsForTest()
 }
 
 func TestFixturesAreConsistent(t *testing.T) {

models/main_test.go

@@ -20,7 +20,7 @@ import (
 
 func init() {
 	setting.SetCustomPathAndConf("", "", "")
-	setting.LoadForTest()
+	setting.InitProviderAndLoadCommonSettingsForTest()
 }
 
 // TestFixturesAreConsistent assert that test fixtures are consistent

models/migrations/base/tests.go

@@ -149,13 +149,13 @@ func MainTest(m *testing.M) {
 	setting.AppDataPath = tmpDataPath
 
 	setting.SetCustomPathAndConf("", "", "")
-	setting.LoadForTest()
+	setting.InitProviderAndLoadCommonSettingsForTest()
 	if err = git.InitFull(context.Background()); err != nil {
 		fmt.Printf("Unable to InitFull: %v\n", err)
 		os.Exit(1)
 	}
-	setting.InitDBConfig()
-	setting.NewLogServices(true)
+	setting.LoadDBSetting()
+	setting.InitLogs(true)
 
 	exitStatus := m.Run()