Add an option to soft delete instance actions

Registered by Pierre-Samuel LE STANG

The goal is to add an option in nova that allow the operator to choose if he wants the instance actions to be soft-deleted when an instance is soft-deleted or not.
The default behavior is actually to not soft-delete the instance actions on instance deletion therefore the default value of this option should be False.
We should also implement the possibility to retrieve deleted instance actions as we do for instances.

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
Pierre-Samuel LE STANG
Direction:
Needs approval
Assignee:
None
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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discussing this on irc it was clarifed that the request is to add a config option that allows the instnace actions to be soft delete instead of hard deleting them on instnace delete.

(?)

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