Add functionality to deprecate policies

Registered by ChangBo Guo(gcb)

Add the ability to invoke deprecation messages when certain policies are used. This gives developers a way to communicate changing policies to operators in a programmable way.

Blueprint information

Status:
Not started
Approver:
ChangBo Guo(gcb)
Priority:
Undefined
Drafter:
Lance Bragstad
Direction:
Needs approval
Assignee:
Lance Bragstad
Definition:
Approved
Series goal:
None
Implementation:
Unknown
Milestone target:
None

Related branches

Sprints

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Spec Review : https://review.openstack.org/#/c/500141
Add functionality to deprecate policies : https://review.openstack.org/#/c/509909/

Gerrit topic: https://review.openstack.org/#q,topic:bp/policy-deprecation,n,z

Addressed by: https://review.openstack.org/509909
    Add functionality to deprecate policies

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