Make sure config testing is done in tempdir

pkg/utils/config/config_test.go

@@ -1,9 +1,13 @@
 package config
 
 import (
+	"os"
+	"path"
+	"sync"
 	"testing"
 
 	"github.com/minio-io/minio/pkg/utils/crypto/keys"
+	"github.com/minio-io/minio/pkg/utils/helpers"
 	. "gopkg.in/check.v1"
 )
 
@@ -15,7 +19,16 @@ func Test(t *testing.T) { TestingT(t) }
 
 func (s *MySuite) TestConfig(c *C) {
 	conf := Config{}
-	conf.SetupConfig()
+	conf.configPath, _ = helpers.MakeTempTestDir()
+	defer os.RemoveAll(conf.configPath)
+	conf.configFile = path.Join(conf.configPath, "config.json")
+	if _, err := os.Stat(conf.configFile); os.IsNotExist(err) {
+		_, err = os.Create(conf.configFile)
+		if err != nil {
+			c.Fatal(err)
+		}
+	}
+	conf.configLock = new(sync.RWMutex)
 
 	accesskey, _ := keys.GetRandomAlphaNumeric(keys.MINIO_ACCESS_ID)
 	secretkey, _ := keys.GetRandomBase64(keys.MINIO_SECRET_ID)