When we will be restoring ttys we need that restore
procedure for master peers will be yielded earlier
than for slave peers due to ttys specifics. With this
commit we introduce @tty_slaves list which will allow
us to order tty file restore procesure.

Because we need to fetch which list to be used depending
on tty type this patch extend select_ps_list with fdinfo_list_entry
parameter.

v2 (by xemul@):
 - make sure the epoll list is still last
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>