core: Block live storage migration to domain of a different type

This change fails live storage migration CDA part in case that the source
storage domain and the destination domain are not both either a file
type domain or a block domain

Change-Id: Iec4c34132a1a619527627cfa47fa99df3a023b62
Signed-off-by: Tal Nisan <tnisan@redhat.com>