Do not clear/replace console on `stack ssh` command

[kadamwhite]

When SSH'ing into a stack, the current console backscroll is replaced wholesale. This makes it frustrating to work in a session on and off, as your prior commands are constantly removed from view when you reconnect, and you need to copy any output to a safe place before starting fresh.

VIP's CLI starts inline without replacing what came before, and I find that an overwhelmingly more usable experience.

I'd like to suggest we alter the ssh subcommand to not clear the terminal on connection, if possible.

[rmccue]

This is, unfortunately, a limitation of the shell session backend itself right now; it's the server itself running clear. I'll file an issue to see about removing it on that end.

[kadamwhite]

Gotcha, that makes sense (and I suspect the reason there wasn't already an issue for this was because you told me that in slack years ago; thanks for the reminder.) It's definitely a "papercut" so thanks for filing an issue on that end.