Only show scenario options when multiple are available #282
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This removes the option to disable and enable scenarios when there's only a single one available. That assumes the scenario is already enabled.
If there is only one, there is also no reason to switch scenarios. That makes force and compare not needed.
The --scenario and --list-scenarios are kept in because instructions can refer to an explicit scenario. That keeps the installation manual consistent.
This is completely untested, but it's here to illustrate the point I made in https://github.com/theforeman/kafo/pull/280/files#r499792034.