fix incorrect 'wait' use in init-bottom#12
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'wait' is a shell built-in that waits for children of the current process, but init-premount's run_tailscale / tailscaled instance isn't a child of the running init-bottom. Replace with a loop that waits $TAILSCALE_SHUTDOWN_TIMEOUT seconds for tailscaled to shut down.
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Fix incorrect use of
waitshell built-in in init-bottom, and also comment the various exit criteria forwait_for_tailscaled, since they're somewhat subtle.