[Bug 1610721] [NEW] Ctrl+S in terminal causes shutdown/reboot (init) to hang

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1. Boot an Ubuntu 16.04 machine that doesn't have an X server installed
2. When you get the terminal log-in prompt (on tty1), instead of logging in, press Ctrl+S to stop terminal flow
3. Connect to the machine via SSH
4. Run "sudo init 0" via SSH

The init command hangs. Only when you press Ctrl+Q in the terminal does
the machine shut down.

This behavior is confusing when you accidentally hit Ctrl+S. It also
means that you cannot shut down or reboot the machine remotely if
someone has pressed Ctrl+S locally.

Pressing the power button instead of running "init 0" produces the
behavior as well - nothing happens until you press Ctrl+Q.

I'm attaching a screen recording to illustrate the problem.

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment
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Ctrl+S in terminal causes shutdown/reboot (init) to hang
https://bugs.launchpad.net/bugs/1610721
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