log: Enable loggers just after configuration load (minio#3348)

It would make sense to enable logger just after config initialisation.
That way, errorIf() and fatalIf() will be usable and can catch error
like invalid access and key errors.

cmd/main.go

@@ -167,11 +167,16 @@ func Main() {
 
 		// Initialize config.
 		configCreated, err := initConfig()
-		fatalIf(err, "Unable to initialize minio config.")
+		if err != nil {
+			console.Fatalf("Unable to initialize minio config. Err: %s.\n", err)
+		}
 		if configCreated {
 			console.Println("Created minio configuration file at " + mustGetConfigPath())
 		}
 
+		// Enable all loggers by now so we can use errorIf() and fatalIf()
+		enableLoggers()
+
 		// Fetch access keys from environment variables and update the config.
 		accessKey := os.Getenv("MINIO_ACCESS_KEY")
 		secretKey := os.Getenv("MINIO_SECRET_KEY")
@@ -189,9 +194,6 @@ func Main() {
 			fatalIf(errInvalidArgument, "Invalid secret key. Accept only a string containing from 8 to 40 characters.")
 		}
 
-		// Enable all loggers by now.
-		enableLoggers()
-
 		// Init the error tracing module.
 		initError()