Bug#760916: brltty interferes with getty autostart

[Dave Mielke]

There's another case where brltty needs to "see" a vt when it isn't open. For 
example, a command can be run asynchronously in a free vt via the openvt 
command. After the command finishes, the output remains on the vt's screen even 
though the vt itself has been closed. The user needs to still be able to switch 
to that vt and read it.

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