Add new model to operate log (#3546)

* [Update] 添加一下model到operate log, [platform,remoteapppermission,changeauthplan,gatherusertask]

* [Bugfix] 修改了返回platform的几个位置，修改了command execution的url

* [Update] 优化ops task表结构，避免列表页查询几十次sql, 优化了基础的encryptjsonfield

* [Update] 修改adhoc 返回的become字段，避免密码泄露

* [Update] 修改变量名称

apps/users/models/user.py

@@ -17,15 +17,13 @@ from django.utils import timezone
 from django.shortcuts import reverse
 
 from orgs.utils import current_org
-from common.utils import get_signer, date_expired_default, get_logger, lazyproperty
+from common.utils import signer, date_expired_default, get_logger, lazyproperty
 from common import fields
 from ..signals import post_user_change_password
 
 
 __all__ = ['User']
 
-signer = get_signer()
-
 logger = get_logger(__file__)