using tenacity instead of retrying

Registered by Rajat Dhasmana

The retrying library is no longer maintained.
Tenacity originated from a friendly fork of retrying library.

Cinder is currently using the retrying library.
Since tenacity has new functionalities and constantly maintained,
it will be better to switch to tenacity.

https://github.com/jd/tenacity

Blueprint information

Status:
Complete
Approver:
None
Priority:
Undefined
Drafter:
Rajat Dhasmana
Direction:
Needs approval
Assignee:
None
Definition:
Obsolete
Series goal:
None
Implementation:
Unknown
Milestone target:
None
Completed by
Sean McGinnis

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