deepcopy of ATTR_NOT_SPECIFIED creates new object

[Brandon Logan]

ATTR_NOT_SPECIFIED is meant to be a constant value, but since it is just an instance of an object(), doing a copy.deepcopy of it will create a new instantiation of object.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/311858

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/311858
Committed: https://git.openstack.org/cgit/openstack/neutron-lib/commit/?id=d33b62b0e785d09ae59b14e18fd183bd7d2fb206
Submitter: Jenkins
Branch: master

commit d33b62b0e785d09ae59b14e18fd183bd7d2fb206
Author: Brandon Logan <email address hidden>
Date: Mon May 2 16:12:59 2016 -0500

    Maintain ATTR_NOT_SPECIFIED constant with deepcopy

    ATTR_NOT_SPECIFIED needs to always remain the same value, but
    deepcopy will instantiate a new object() if it encounters
    ATTR_NOT_SPECIFIED. This ensures any deepcopy of a dict that
    includes ATTR_NOT_SPECIFIED will always return the same instantiation
    of object.

    Change-Id: I9685dfff24e36992e90919bd7c2be2cda6c075f3
    Closes-Bug: #1577571
    Co-Authored-By: Kevin Benton <email address hidden>

[Doug Hellmann (doug-hellmann)]

This issue was fixed in the openstack/neutron-lib 0.2.0 release.

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/neutron/+/800682

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/neutron/+/800682
Committed: https://opendev.org/openstack/neutron/commit/1eabf046f3f6d25c8cf380a0c5e219f4f905b8e7
Submitter: "Zuul (22348)"
Branch: master

commit 1eabf046f3f6d25c8cf380a0c5e219f4f905b8e7
Author: Rodolfo Alonso Hernandez <email address hidden>
Date: Tue Jul 13 16:24:12 2021 +0000

    Remove "_protect_original_resources" workaround

    Fix in neutron-lib was merged in [1]. We can now remove the
    workaround implemented.

    Related-Bug: #1577571

    [1]https://review.opendev.org/c/openstack/neutron-lib/+/311858

    Change-Id: I3092659882b966745839611c848523171697bc9a