[patch 0/3] TTY flags fetching

[gorcunov]

Hi guys, I've updated the series on top of current tty-next Greg's tree.
The series introduces new ioctl codes TIOCGPKT, TIOCGPTLCK, TIOCGEXCL to
fetch pty's packet mode and locking state, and exclusive mode of it, which
we really need to know when we do checkpoint-restore transition.

Please review, thanks!
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