Merge branch 'errcode' of github.com:OpenIMSDK/Open-IM-Server into errcode

# Conflicts:
#	pkg/common/mw/rpc_server_interceptor.go

pkg/common/db/relation/user_model.go

@@ -9,11 +9,11 @@ import (
 )
 
 type UserGorm struct {
-	DB *gorm.DB
+	DB gorm.DB
 }
 
 func NewUserGorm(DB *gorm.DB) relation.UserModelInterface {
-	return &UserGorm{DB: DB.Model(&relation.UserModel{})}
+	return &UserGorm{DB: *DB.Model(&relation.UserModel{})}
 }
 
 // 插入多条