Fix lint and format code in core dir

core/config/xml/xml.go

@@ -102,7 +102,6 @@ func (c *ConfigContainer) Sub(key string) (config.Configer, error) {
 	return &ConfigContainer{
 		data: sub,
 	}, nil
-
 }
 
 func (c *ConfigContainer) sub(key string) (map[string]interface{}, error) {
@@ -170,7 +169,6 @@ func (c *ConfigContainer) DefaultInt64(key string, defaultVal int64) int64 {
 		return defaultVal
 	}
 	return v
-
 }
 
 // Float returns the float value for a given key.

core/config/xml/xml_test.go

@@ -25,7 +25,6 @@ import (
 )
 
 func TestXML(t *testing.T) {
-
 	var (
 		// xml parse should incluce in <config></config> tags
 		xmlcontext = `<?xml version="1.0" encoding="UTF-8"?>
@@ -149,7 +148,6 @@ func TestXML(t *testing.T) {
 	err = xmlconf.Unmarshaler("mysection", sec)
 	assert.Nil(t, err)
 	assert.Equal(t, "MySection", sec.Name)
-
 }
 
 type Section struct {