MM-9849 Added tracking of which settings are set through environment variables (#8586)

* MM-9849 Added tracking of which settings are set through environment variables

* Removed old version of viper

* Added forked version of viper

* Fixed unit tests

* Fixed more unit tests

* Removed copy from App.GetEnvironmentConfig

cmd/commands/config_flag_test.go

@@ -22,7 +22,7 @@ func TestConfigFlag(t *testing.T) {
 	defer os.RemoveAll(dir)
 
 	utils.TranslationsPreInit()
-	config, _, err := utils.LoadConfig("config.json")
+	config, _, _, err := utils.LoadConfig("config.json")
 	require.Nil(t, err)
 	configPath := filepath.Join(dir, "foo.json")
 	require.NoError(t, ioutil.WriteFile(configPath, []byte(config.ToJson()), 0600))

cmd/commands/message_export_test.go

@@ -57,7 +57,7 @@ func writeTempConfig(t *testing.T, isMessageExportEnabled bool) string {
 	require.NoError(t, err)
 
 	utils.TranslationsPreInit()
-	config, _, appErr := utils.LoadConfig("config.json")
+	config, _, _, appErr := utils.LoadConfig("config.json")
 	require.Nil(t, appErr)
 	config.MessageExportSettings.EnableExport = model.NewBool(isMessageExportEnabled)
 	configPath := filepath.Join(dir, "foo.json")