Implement snapshot instances list

Registered by zhongjun

We have both snapshot id and snapshot instance id in Manila. The snapshot named by snapshot instance id when user create a snapshot, so user can not quickly find snapshot(on array) according to snapshot id. So add snapshot_instance_list API to show the relationship between snapshot id and snapshot instance id.
API methods will be created:
snapshot_instance_list [snapshot_id]
snapshot_instance_show <snapshot_instance>
snapshot_instance_reset_status

Blueprint information

Status:
Complete
Approver:
Ben Swartzlander
Priority:
Undefined
Drafter:
zhongjun
Direction:
Needs approval
Assignee:
zhongjun
Definition:
Approved
Series goal:
Proposed for newton
Implementation:
Implemented
Milestone target:
None
Started by
zhongjun
Completed by
zhongjun

Related branches

Sprints

Whiteboard

Gerrit topic: https://review.openstack.org/#q,topic:bp/snapshot-instances,n,z

Addressed by: https://review.openstack.org/252184
    dd snapshot instances list

Addressed by: https://review.openstack.org/304449
    [WIP]Add snapshot instances admin APIs

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Work Items

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