Add extract-fn to all datasource translators

Registered by Alexander Yip

Allow a datasource translator to have a general purpose extract-fn that preprocesses the object before applying the rest of the translator. This is useful in cases where the data object is not structured as python dicts/lists/objects, for example, if the data object is a json string.

Blueprint information

Status:
Complete
Approver:
Tim Hinrichs
Priority:
Medium
Drafter:
Alexander Yip
Direction:
Approved
Assignee:
Masahito Muroi
Definition:
Approved
Series goal:
Accepted for mitaka
Implementation:
Implemented
Milestone target:
milestone icon mitaka-2
Started by
Masahito Muroi
Completed by
Tim Hinrichs

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Gerrit topic: https://review.openstack.org/#q,topic:bp/add-extract-fn-to-all-translators,n,z

Addressed by: https://review.openstack.org/213370
    Add an object extract function key to translators

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