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[Tianpeng Wang <timon86.wang@xxxxxxxxx>]

Public bug reported:

https://github.com/openstack/keystone/blob/cd906266e67c8a8a8ae9676d2fa6dd1bd2f59bd8/keystone/common/cache/core.py#L102

As we already learned, we cannot replace descriptors on an object
instance, so after calling `apply_invalidation_patch`, it merely set
both `_hard_invalidated` and `_soft_invalidated` **once** from the cache
backend.

** Affects: keystone
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1602906

Title:
  apply_invalidation_patch will not work as intended

Status in OpenStack Identity (keystone):
  New

Bug description:
  https://github.com/openstack/keystone/blob/cd906266e67c8a8a8ae9676d2fa6dd1bd2f59bd8/keystone/common/cache/core.py#L102

  As we already learned, we cannot replace descriptors on an object
  instance, so after calling `apply_invalidation_patch`, it merely set
  both `_hard_invalidated` and `_soft_invalidated` **once** from the
  cache backend.

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