Add finalize plugin

Registered by Adrian Vladu

Some providers require that a specific logic to be run when all the plugins finish executing.
This logic can be wrapped by a specific plugin stage -- which we will call finalize.

Every metadata provider will return a lambda to be executed if the finalize stage is enabled.

Blueprint information

Status:
Complete
Approver:
None
Priority:
Undefined
Drafter:
Adrian Vladu
Direction:
Needs approval
Assignee:
Adrian Vladu
Definition:
Obsolete
Series goal:
None
Implementation:
Not started
Milestone target:
None
Completed by
Adrian Vladu

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

Addressed by: https://review.openstack.org/381182
    Implement finalize step and plugin for packet

(?)

Work Items

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