MM-14143 config cleanup final (#10374)

* TestGetLicenseFileFromDisk: avoid using fileutils.FindConfigFile

* config: abstract config-related file access, extend memory store

* simplify config validate to avoid file knowledge

* fix relative file tests

* cluster: fix ConfigChanged event

The old and new configurations were swapped when notifying the enterprise code of configuration changes, creating needless instability in propagating config updates across a cluster.

* config/database: ignore duplicates

* test cleanup

* remove unnecessary Save() in test

config/main_test.go

@@ -1,6 +1,7 @@
 package config_test
 
 import (
+	"fmt"
 	"testing"
 
 	"github.com/go-sql-driver/mysql"
@@ -22,15 +23,15 @@ func TestMain(m *testing.M) {
 	mainHelper.Main(m)
 }
 
-// truncateTables clears tables used by the config package for reuse in other tests
-func truncateTables(t *testing.T) {
+// truncateTable clears the given table
+func truncateTable(t *testing.T, table string) {
 	t.Helper()
 	sqlSetting := mainHelper.GetSqlSettings()
 	sqlSupplier := mainHelper.GetSqlSupplier()
 
 	switch *sqlSetting.DriverName {
 	case model.DATABASE_DRIVER_MYSQL:
-		_, err := sqlSupplier.GetMaster().Db.Exec("TRUNCATE TABLE Configurations")
+		_, err := sqlSupplier.GetMaster().Db.Exec(fmt.Sprintf("TRUNCATE TABLE %s", table))
 		if err != nil {
 			if driverErr, ok := err.(*mysql.MySQLError); ok {
 				// Ignore if the Configurations table does not exist.
@@ -42,10 +43,18 @@ func truncateTables(t *testing.T) {
 		require.NoError(t, err)
 
 	case model.DATABASE_DRIVER_POSTGRES:
-		_, err := sqlSupplier.GetMaster().Db.Exec("TRUNCATE TABLE Configurations")
+		_, err := sqlSupplier.GetMaster().Db.Exec(fmt.Sprintf("TRUNCATE TABLE %s", table))
 		require.NoError(t, err)
 
 	default:
 		t.Fatalf("unsupported driver name: %s", *sqlSetting.DriverName)
 	}
 }
+
+// truncateTables clears tables used by the config package for reuse in other tests
+func truncateTables(t *testing.T) {
+	t.Helper()
+
+	truncateTable(t, "Configurations")
+	truncateTable(t, "ConfigurationFiles")
+}