Support stop signal for stack actions

Registered by huangtianhua

https://blueprints.launchpad.net/heat/+spec/stack-breakpoint
This blueprint just supports to continue the create/update after unset hooks for resources, user may want to stop the create/update after find something wrong in debugging. So I believe we can add a new signal, such as user can specify stop-create and stop-update in details to support this user case.

Blueprint information

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

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