userportal: fix SD selection on clone VM from template

Fixing storage domain selection when creating a VM
from template using clone allocation.

DisksAllocationModel -> getImageToDestinationDomainMap()
should be passed to AddVmFromTemplateParameters
(for getting user's selected values).

Change-Id: Ic1d372d30b3bcf110fa2f63847f6dfa32f8e6b62
Bug-Url: https://bugzilla.redhat.com/928399
Signed-off-by: Daniel Erez <derez@redhat.com>