iter: Comment why we ack post-dump notify after restore

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
phaul: Enable TCP migration if htypes allows for that

Now we have bridged ovz networking migrate successfully,
so enable the --tcp-established option for CRIU if
possible.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
htypes: Regroup the callbacks

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>