Add a polling_flow pattern for retrying a set of tasks up to a timeout

Registered by Greg Hill on 2016-03-10

A common workflow pattern consists of something like this:

CreateServer()
while not server.done:
    CheckIfServerIsDone()

There should be a construct in taskflow to make such patterns easier.

Blueprint information

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

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Gerrit topic: https://review.openstack.org/#q,topic:bp/polling-flows,n,z

Addressed by: https://review.openstack.org/291242
    Add polling_flow pattern and associated Timeout retries

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