Swift Client should use "Expect: 100-continue" header during upload.

Registered by Sridevi Koushik

During upload, if the Auth token is expired, the swift client
unnecessarily uploads the chunks and fails at the end.
Instead, we could have a fail fast mechanism using the
100-continue handshake. Only if the client receives a 100 continue
from swift, it should continue uploading the chunks.
Otherwise, if a 401 is received, it should fetch a fresh auth
token and retry the request.

Blueprint information

Status:
Not started
Approver:
Iccha Sethi
Priority:
Undefined
Drafter:
None
Direction:
Needs approval
Assignee:
Sridevi Koushik
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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Gerrit topic: https://review.openstack.org/#q,topic:bp/should-use-100-continue-header,n,z

Addressed by: https://review.openstack.org/55517
    Use "Expect: 100-continue" header during upload.

Addressed by: https://review.openstack.org/56558
    Swiftclient should switch to using bufferedhttp

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