Add extra data to the Stack table for convergence

Registered by Zane Bitter on 2015-01-27

- See https://github.com/zaneb/heat-convergence-prototype/blob/resumable/converge/stack.py
- Extra fields in the simulator (above) are: prev_tmpl_key, current_traversal, current_deps
- Updates must be atomic w.r.t. current_traversal, using "UPDATE ... WHERE ..." form as discussed in http://www.joinfu.com/2015/01/understanding-reservations-concurrency-locking-in-nova/

Blueprint information

Status:
Complete
Approver:
Zane Bitter
Priority:
High
Drafter:
Zane Bitter
Direction:
Approved
Assignee:
Anant Patil
Definition:
Approved
Series goal:
Accepted for kilo
Implementation:
Implemented
Milestone target:
milestone icon 2015.1.0
Started by
Sergey Kraynev on 2015-02-18
Completed by
Angus Salkeld on 2015-03-06

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