Add polling option for progress bar while creating instance snapshot

Registered by Tzach Shefi

When creating a snapshot from an instance via cli we have --poll option which shows a progress bar indicator. We should add such an option under Horizon to show progress indication for instance snapshot creation.

Blueprint information

Status:
Complete
Approver:
None
Priority:
Low
Drafter:
Tzach Shefi
Direction:
Needs approval
Assignee:
None
Definition:
Obsolete
Series goal:
None
Implementation:
Unknown
Milestone target:
None
Completed by
Rob Cresswell

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