Change-since filter for retrieving

Registered by huangtianhua on 2015-07-22

Currently we can only query stack or event at a given time stamp(such as 'updated_at'). It's helpful to add a change-since filter so we can retrieve during a specific period.
There is a openstack-specs: https://review.openstack.org/#/c/203915/

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

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