Make tasks interruptible

Registered by Max Lobur

Currently there are a few bps dedicated for a common purpose:
https://blueprints.launchpad.net/ironic/+spec/abort-deployment
https://blueprints.launchpad.net/ironic/+spec/breaking-resource-locks
https://blueprints.launchpad.net/ironic/+spec/generic-timeouts

We need an ability to interrupt long-running, dangling tasks, in particular - deployment. Cancellation should be performed automatically if the task timeout expired, or manually - on the user demand. We don't want to break the state of the node and conductor, therefore cancellation should not be performed at any arbitrary point of task, instead there should be a set of checkpoints in code at which the task can be cancelled.

See specification for details

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
Max Lobur
Direction:
Needs approval
Assignee:
None
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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