Implement function "instance_exists"

Registered by Prabhat Ranjan

"instance_exists" function checks existence of an instance on the host.

The default implementation works for all drivers, but it is not particularly efficient. Maintainers of the virt drivers are encouraged to override this method with something more efficient.

Blueprint information

Status:
Not started
Approver:
Prabhat Ranjan
Priority:
Undefined
Drafter:
Prabhat Ranjan
Direction:
Needs approval
Assignee:
Prabhat Ranjan
Definition:
Approved
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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