Implement trust support for cinder

Registered by Bin Zhou

when user create volume from image, it may takes a long time(usually more than 1 hour) to download image from glance if the image size is too large, and token expires then the volume creating failed.
The best case to prevent from this situation is implement trust support in cinder. It allows to request the new token if the previous token has been expired.
similar blueprint has been proposed in glance: https://blueprints.launchpad.net/glance/+spec/trust-authentication

Blueprint information

Status:
Not started
Approver:
Sean McGinnis
Priority:
Low
Drafter:
Bin Zhou
Direction:
Approved
Assignee:
Bin Zhou
Definition:
Approved
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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Gerrit topic: https://review.openstack.org/#q,topic:bp/intends,n,z

Addressed by: https://review.openstack.org/331925
    Implement trust support for cinder

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