FEATURE: Add warning to soup about ssh

[dougburks]

No description provided.

[dougburks]

Tested and verified:

SOUP - Security Onion UPdater

Please review the following for more information about the update process and recent updates:
https://docs.securityonion.net/en/2.4/soup.html
https://blog.securityonion.net

WARNING: If you run soup via an SSH session and that SSH session terminates, then any processes running in that session would terminate. You should avoid leaving soup unattended especially if the machine you are SSHing from is configured to sleep after a period of time. You might also consider using something like screen or tmux so that if your SSH session terminates, the processes will continue running on the server.

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