[Bug 1827120] Re: application credentials created via Horizon with the admin project scope have project_id == None

[Dmitrii Shcherbakov]

** Attachment added: "dashboard_cred_no_project.png"
   https://bugs.launchpad.net/ubuntu/+source/horizon/+bug/1827120/+attachment/5260368/+files/dashboard_cred_no_project.png

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Title:
  application credentials created via Horizon with the admin project
  scope have project_id == None

Status in horizon package in Ubuntu:
  New

Bug description:
  Environment: tested with Stein from UCA (deployed via 19.04 charms).

  1) login to horizon into the "admin" project;

  keystone.conf:

  [resource]
  admin_project_domain_name = admin_domain
  admin_project_name = admin

  2) go to the "Application Credentials" tab;

  3) create a credential with a unique name without specifying other
  parameters besides Admin and/or Member roles (auto-filled secret, no
  expiration);

  note: project_id is retrieved from the token, it is not a field in the
  form

  4) observe that project_id is set to None

  5) encounter the following error during authentication using the
  application credential

  TypeError: one of the hex, bytes, bytes_le, fields, or int arguments
  must be given

  see the text file attached with a pdb log.

  6) do the same via CLI and observe that project_id is specified and it
  is possible to log in

  CLI workflow (project_id is present):

  openstack application credential create --role Member --role Admin testcred
  +--------------+----------------------------------------------------------------------------------------+
  | Field        | Value                                                                                  |
  +--------------+----------------------------------------------------------------------------------------+
  | description  | None                                                                                   |
  | expires_at   | None                                                                                   |
  | id           | bb845e9e18634e7c8cfc36d80179ab05                                                       |
  | name         | testcred                                                                               |
  | project_id   | ebfc7e0457f048aa960d633141115cd1                                                       |
  | roles        | Member Admin                                                                           |
  | secret       | zCka3asrEouKqCnJlfRdk-Qg3gDM0WSbjTqxlYaBO_ygyQCpZY8NPnSQhm6o802O-r22eHWv79-iHJ5sJQ_kUw |
  | system       | None                                                                                   |
  | unrestricted | False                                                                                  |
  | user_id      | 95067aae3e634a29830f91a53dd0d80a                                                       |
  +--------------+----------------------------------------------------------------------------------------+

  
  Note the difference:

  openstack application credential list
  +----------------------------------+----------------+----------------------------------+-------------+------------+
  | ID                               | Name           | Project ID                       | Description | Expires At |
  +----------------------------------+----------------+----------------------------------+-------------+------------+
  | 344ddd90249645608b625131f82d056b | clicred        | ebfc7e0457f048aa960d633141115cd1 | None        | None       |
  | d681d11d4744421f81dd32ca0459d54d | dashboard_cred | None                             | None        | None       |
  +----------------------------------+----------------+----------------------------------+-------------+------------+

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