custom attribute values not automatically updated for controller settings (APP)

[ghost]

[Version] 17.2 2017/07/05

[How to reproduce]

1. my app db has an incorrect API_USER_PWD for openstack e.g. _crypt:badpassword because I have customers with different passwords.
2. as supplier or customer admin (depending on definition of custom attribute) set API_USER_PWD using custom attributes (ess.openstack)
3. restart app domain
4. try to access custom tab or other method that involves authentication.
5. as customer go to existing openstack (or other) subscription and check custom tab.

[Expected result] custom tab shows status of all vms

[Observed result] custom tab does not show status (or displays error)

[Details] A subscription must be created or updated in order for the custom attributes (concerting controllers) to be updated in app db. This is a problem. The same problem exists if a custom attribute is deleted.