Support 'ALL_OLD' return value for 'put_item' method

Registered by Illia Khudoshyn

While using "put_item" request we do not have any information about presence of item with same key as we put. According to DynamoDB API we must have an ability to pass "ReturnValue": "ALL_OLD" in put_item request, so replaced item will be returned in response.

Blueprint information

Status:
Complete
Approver:
Ilya Sviridov
Priority:
High
Drafter:
Andrii Ostapenko
Direction:
Approved
Assignee:
Andrii Ostapenko
Definition:
Approved
Series goal:
Accepted for juno
Implementation:
Implemented
Milestone target:
milestone icon 2014.2
Started by
Andrii Ostapenko
Completed by
Ilya Sviridov

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Sprints

Whiteboard

Gerrit topic: https://review.openstack.org/#q,topic:bp/all-old-for-put-item,n,z

Addressed by: https://review.openstack.org/121911
    (WIP) "ALL_OLD" return_values for put_item

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