libcontainer: remove loadConfig which is the unused function

Signed-off-by: Kenta Tada <Kenta.Tada@sony.com>

libcontainer/configs/config_linux_test.go

@@ -1,10 +1,6 @@
 package configs
 
 import (
-	"encoding/json"
-	"fmt"
-	"os"
-	"path/filepath"
 	"testing"
 )
 
@@ -12,49 +8,6 @@ var (
 	HookNameList = []HookName{Prestart, CreateRuntime, CreateContainer, StartContainer, Poststart, Poststop}
 )
 
-func loadConfig(name string) (*Config, error) {
-	f, err := os.Open(filepath.Join("../sample_configs", name))
-	if err != nil {
-		return nil, err
-	}
-	defer f.Close()
-
-	var container *Config
-	if err := json.NewDecoder(f).Decode(&container); err != nil {
-		return nil, err
-	}
-
-	// Check that a config doesn't contain extra fields
-	var configMap, abstractMap map[string]interface{}
-
-	if _, err := f.Seek(0, 0); err != nil {
-		return nil, err
-	}
-
-	if err := json.NewDecoder(f).Decode(&abstractMap); err != nil {
-		return nil, err
-	}
-
-	configData, err := json.Marshal(&container)
-	if err != nil {
-		return nil, err
-	}
-
-	if err := json.Unmarshal(configData, &configMap); err != nil {
-		return nil, err
-	}
-
-	for k := range configMap {
-		delete(abstractMap, k)
-	}
-
-	if len(abstractMap) != 0 {
-		return nil, fmt.Errorf("unknown fields: %s", abstractMap)
-	}
-
-	return container, nil
-}
-
 func TestRemoveNamespace(t *testing.T) {
 	ns := Namespaces{
 		{Type: NEWNET},