fix: use its own lock in serverConfigV17 (#4014)

Previously serverConfigV17 used a global lock that made any instance of
serverConfigV17 depended on single global serverConfigMu.

This patch fixes by having individual lock per instances.

cmd/gateway-main.go

@@ -104,17 +104,9 @@ func newGatewayConfig(accessKey, secretKey, region string) error {
 		SecretKey: secretKey,
 	})
 
-	// Set default printing to console.
-	srvCfg.Logger.SetConsole(NewConsoleLogger())
-
 	// Set custom region.
 	srvCfg.SetRegion(region)
 
-	// Create certs path for SSL configuration.
-	if err := createConfigDir(); err != nil {
-		return err
-	}
-
 	// hold the mutex lock before a new config is assigned.
 	// Save the new config globally.
 	// unlock the mutex.
@@ -139,8 +131,7 @@ func gatewayMain(ctx *cli.Context) {
 	// TODO: add support for custom region when we add
 	// support for S3 backend storage, currently this can
 	// default to "us-east-1"
-	err := newGatewayConfig(accessKey, secretKey, "us-east-1")
-	fatalIf(err, "Unable to initialize gateway config")
+	newGatewayConfig(accessKey, secretKey, globalMinioDefaultRegion)
 
 	// Get quiet flag from command line argument.
 	quietFlag := ctx.Bool("quiet") || ctx.GlobalBool("quiet")
@@ -151,6 +142,9 @@ func gatewayMain(ctx *cli.Context) {
 	// First argument is selected backend type.
 	backendType := ctx.Args().First()
 
+	// Create certs path for SSL configuration.
+	fatalIf(createConfigDir(), "Unable to create configuration directory")
+
 	newObject, err := newGatewayLayer(backendType, accessKey, secretKey)
 	fatalIf(err, "Unable to initialize gateway layer")