Analyze/propose snapper snapshot TIMELINE settings

[kdave]

Implement script that wil analyze or propose settings for snapper TIMELINE values according to the recommendations in "Tuning periodic snapshotting".

analyze:

• scan all snapper configs on the system
• try to match to the closest preset
• present results in a human readable form

propose:

• print values of the proposed settings for a given profile
• allow dry-run or apply the settings