Add "concurrency" property for workflow

Registered by Limor Stotland on 2015-11-02

Adding possibility to make singleton workflows (only one instance of this we will run at a time).
The concurrency policy will declare how many running instances are allowed for a specific wf.
* Concurrency will have default value of -1 (no limit on number of running instances )

Blueprint information

Status:
Not started
Approver:
Renat Akhmerov
Priority:
Medium
Drafter:
Limor Stotland
Direction:
Approved
Assignee:
None
Definition:
Approved
Series goal:
None
Implementation:
Not started
Milestone target:
None

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We need a really good spec for this.

(?)

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