"retry" task policy

Registered by Renat Akhmerov

We need to create a policy to retry task in case of error. The syntax is as follows:

taskA:
  policies:
    retry:
      delay: 10
      count: 5
      break-on: $.my_val = 10

Blueprint information

Status:
Complete
Approver:
None
Priority:
Medium
Drafter:
Renat Akhmerov
Direction:
Needs approval
Assignee:
Nikolay Makhotkin
Definition:
New
Series goal:
Accepted for juno
Implementation:
Implemented
Milestone target:
milestone icon 0.1
Started by
Nikolay Makhotkin
Completed by
Renat Akhmerov

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Gerrit topic: https://review.openstack.org/#q,topic:bp/mistral-workflow-wait-policy,n,z

Addressed by: https://review.openstack.org/119354
    Implement wait-after policy and retry

(?)

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