p.haul: specify secondary ploop disks as external in dump request options
p.haul: specify secondary ploop disks as external in dump request options

Specify secondary ploop disks (second, third and so on) as external
in dump request options for Virtuzzo containers.

Signed-off-by: Nikita Spiridonov <e2c2785991de10f66b050593578d4296c6c8705d@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@virtuozzo.com>

arthurlockman/p.haul,xemul/p.haul,xemul/p.haul,jne100/p.haul,jne100/p.haul,xemul/p.haul,aburluka/p.haul,jne100/p.haul,jne100/p.haul,aburluka/p.haul,xemul/p.haul,xemul/p.haul,arthurlockman/p.haul,arthurlockman/p.haul,jne100/p.haul,aburluka/p.haul,arthurlockman/p.haul,aburluka/p.haul,aburluka/p.haul,arthurlockman/p.haul