delete domain raise 500 error if the domain contains idp

[wangxiyuan]

How to reproduce:
1. create domain
   openstack domain create domainA
2. create a idp to the domainA
   openstack identity provider create idpA --domain domainA
3. disable the domainA and then try to delete it.
   openstack domain set domainA --disable
   openstack domain delete domainA

Expect result:
The domainA and its related resource will be deleted

Actual result:
Keystone raise 500 internal error

reproduce example:
http://paste.openstack.org/show/718241/

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/558488

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/558489

[OpenStack Infra (hudson-openstack)]

Change abandoned by wangxiyuan (<email address hidden>) on branch: master
Review: https://review.openstack.org/558488

[Lance Bragstad (lbragstad)]

I was able to recreate this locally. Setting this to high since it is likely a case for deployments using shadow users, domains, and identity providers.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/558489
Committed: https://git.openstack.org/cgit/openstack/keystone/commit/?id=42cf675c40311f5a483df19ff0aa258643d356e3
Submitter: Zuul
Branch: master

commit 42cf675c40311f5a483df19ff0aa258643d356e3
Author: wangxiyuan <email address hidden>
Date: Tue Apr 3 19:45:10 2018 +0800

    Fix 500 error when deleting domain

    If there are idps in a domain, when users try to delete the
    domain, 500 interal error will raise.

    This patch added a new callback event to clean up the related
    idps.

    Closes-bug: #1760809
    Change-Id: I37c8745e4509f69aaa659b130ccbdfe51cf6a1b8

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/keystone 14.0.0.0b2 development milestone.