Check if a snapshot exists when dumping a new snapshot

Registered by Kostja Osipov

Tarantool can dump a snapshot upon "save snapshot" command.
When doing so, it doesn't check that an existing snapshot is present, and thus can overwrite the existing snapshot.
Check if a snapshot exists when dumping a new snapshot.

Blueprint information

Status:
Complete
Approver:
Kostja Osipov
Priority:
Medium
Drafter:
None
Direction:
Needs approval
Assignee:
Roman Tokarev
Definition:
Approved
Series goal:
Accepted for 1.3
Implementation:
Implemented
Milestone target:
milestone icon 1.3.4
Started by
Kostja Osipov
Completed by
Kostja Osipov

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