Engine: set device-id in payload constructor

When adding a new payload its device id need to set since it is inherit
from VmDevice now -
This is true for the default constructor.

Change-Id: I33bdc975070d71923ae21985a371b53d427b61d8
Bug-Url: https://bugzilla.redhat.com/1158010
Signed-off-by: Shahar Havivi <shaharh@redhat.com>