use VT_GETSTATE and tty0 to identify a console_ioctl on linux

ConsoleKit tries to find a valid fd it can issue
VT_WAITACTIVE against by iterating across a file list and issuing
ioctl(fd, KDGKBTYPE, &arg), then checking the return value.  Not all console
devices support this ioctl, so in some cases it never finds a valid file
descriptor to use, and from then on never marks any session active.

We probably ought to be using something like VT_GETSTATE instead of a keyboard
ioctl, but that's not sufficient to fix it.  One fix that seems to work, though
I'm not completely sure if it's the best answer, is to add /dev/tty0 to the list
of files to try before /dev/console.

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