[LU-12655] Add lsnapshot check command

• Type: Improvement
• Resolution: Unresolved
• Priority: Major
• Labels: lsnapshot
• Assignee: WC Triage
• Reporter: Nathaniel Clark

Description

Add command lsnapshot_check to check all components of a snapshot:

• Check if they exist
• Check if they are already mounted
• Check consistency of snapshot components (all have same fs name)