wanghao 5b4d107a87 Update the spec of filtering by time comparison operators for Train
This BP propose to support users can query resources by specifying the time
comparison operators along with created_at or updated_at fields,
and cinder will return all which match the condition.

Will add six time comparison operators in querying API.
"volumes/detail?updated_at=gt:2016-01-01T01:00:00,lt:2016-12-01T01:00:00"

Change-Id: Ia041bf4e1205cdb9c3b94af6566e4850fb54eecc
2019-07-25 09:43:01 +08:00
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