Refactor input/ssh and input/scp

[robertcheramy]

• I have read and understood docs/Issues.md.

Is your feature request related to a problem? Please describe.
Describe the solution you'd like
Some code is duplicated between input/ssh and input/scp. This should be refactored in a Class Oxidized:SSHBase (or Oxidized::SecureShell), inherited by Oxidized::SSH and Oxidized::SCP

Describe alternatives you've considered

• Integrating the code in Oxidized::Input is not a good option.
• There is too much difference to make Oxidized::SCP inherit from Oxidized:SSH

Additional context
More code duplication comes with Issue #3590

[github-actions]

This issue is stale because it has been open 90 days with no activity.