[Bug 1773967] Fix proposed to keystone (stable/stein)

[OpenStack Infra]

Fix proposed to branch: stable/stein
Review: https://review.opendev.org/676200

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https://bugs.launchpad.net/bugs/1773967

Title:
  Application credentials can't be used with group-only role assignments

Status in Ubuntu Cloud Archive:
  New
Status in OpenStack Identity (keystone):
  Fix Released
Status in keystone package in Ubuntu:
  Confirmed

Bug description:
  If a user only has a role assignment on a project via a group
  membership, the user can create an application credential for the
  project but it cannot be used. If someone tries to use it, the debug
  logs will report:

   User <uuid> has no access to project <uuid>

  We need to ensure that any application credential that is created can
  be used so long as it is not expired and the user exists and has
  access to the project they created the application credential for. If
  we decide that application credentials should not be valid for users
  who have no explicit role assignments on projects, then we should
  prevent it from being created and provide a useful message to the
  user.

  This is probably related to
  https://bugs.launchpad.net/keystone/+bug/1589993

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