Perm cache (#3211)

* [Update] 修改用户树的cache

* [Update] 修改用户树缓存

* [Update] telnet (beta) => telnet

apps/assets/models/user.py

@@ -96,7 +96,7 @@ class SystemUser(AssetUser):
     PROTOCOL_CHOICES = (
         (PROTOCOL_SSH, 'ssh'),
         (PROTOCOL_RDP, 'rdp'),
-        (PROTOCOL_TELNET, 'telnet (beta)'),
+        (PROTOCOL_TELNET, 'telnet'),
         (PROTOCOL_VNC, 'vnc'),
     )