Some features like vGPUs require to have allocations to be checked locally
by the virt driver but resize (and cold migrate) was not passing them.
This change just gives the allocations to the target node when the resize
is done by adding the allocations to the finish_migration() interface.
Related-Bug: #1778563
Change-Id: Ifd76289964d513e9544544e5787f5f8999589475