Allow "set device" to close the open modem if we're in

interactive mode.
Use `netfd' in fcntl() and tc[gs]etattr() calls rather than
the hard coded descriptor 0.
Use _FILENO constants from unistd.h

This un-breaks things after my recent `close(0)' in interactive
mode.

Close STDIN_FILENO, and open _PATH_TTY O_RDONLY as `netfd'.  This
has the effect of allowing `show route' to output more than about
a page of data (on FreeBSD, not OpenBSD....).  I have no idea why,
except that it was a direct consequence of the tcsetattr() in
TtyCommandMode().  My previous fix (closing descriptor 0) `fixed'
this because all calls to tcsetattr() failed :-(

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