Now we can split the parasite_infect_seized() into CRIU-specific
part and independent part that is to become compel code.

The API to infect() is for now a bit clumsy, but I will rectify one
a bit more in the next patches.
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>