Comment 2 for bug 1810393

Reviewed: https://review.openstack.org/628132
Committed: https://git.openstack.org/cgit/openstack/keystone/commit/?id=3bcd8968e97a8efd8f9788a8840dd008c490cea1
Submitter: Zuul
Branch: master

commit 3bcd8968e97a8efd8f9788a8840dd008c490cea1
Author: wangxiyuan <email address hidden>
Date: Thu Jan 3 17:40:15 2019 +0800

    Invalidate shadow_federated_user cache when deleting protocol

    When delete identity provider protocol, the related
    shadow_federated_user cache should be invalidated as well.

    Change-Id: Ia1a86724b7a6747fc5177476ee462d8d062978e0
    Closes-bug: 1810393