bhyve: allow specifiying tty by fd

[Roman Bogorodskiy]

Hi,

Currently bhyve(8) allows to specify either stdio or device path as a
TTY device. However, it could be useful to specify a TTY device by file
descriptor, e.g. when bhyve is being executed in an automated way by 
other application, so a result of openpty(3) could be passed to it.

Attached a poc patch for that. It allows to specify fd this way:

bhyve <snip>  -s 31,lpc -l com1,fd=19 vm0

Roman Bogorodskiy
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