tty: Dump a hanging up terminal
tty: Dump a hanging up terminal

If we've met a hanging up terminal we can escape
lot of work but dump a minimum information needed
for restore.

Signed-off-by: Cyrill Gorcunov <7a1ea01eee6961eb1e372e3508c2670446d086f4@openvz.org>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>

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