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[ssh] make TTYs optional #337
There is a limit on the maximum number of TTYs many operating systems can allocate. By default on Linux, this is 4096. Given a run targetting more than 4000 machines, TTYs will be easily exhausted, and so using them should be made optional when typing passwords is not necessary.
Upstream Ansible already supports a flag we can reuse:
Triple-check the meaning of it to ensure it means the same thing we want