storage: Fix iscsi-direct volume size for volumes > 4GiB
storage: Fix iscsi-direct volume size for volumes > 4GiB

Both block_size and nb_block are unit32_t and multiplying them overflows
at 4GiB.

Moreover, the iscsi_*10_* APIs use 32bit number of blocks and thus they
can only address images up to 2TiB with 512B blocks. Let's use 64b
iscsi_*16_* APIs instead.

Signed-off-by: Jiri Denemark <62bdf77dc47919a4d59a91822129d14633cfca81@redhat.com>

andreabolognani/libvirt,zippy2/libvirt,andreabolognani/libvirt,jardasgit/libvirt,libvirt/libvirt,nertpinx/libvirt,nertpinx/libvirt,jfehlig/libvirt,fabianfreyer/libvirt,zippy2/libvirt,crobinso/libvirt,jardasgit/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,olafhering/libvirt,fabianfreyer/libvirt,fabianfreyer/libvirt,crobinso/libvirt,crobinso/libvirt,eskultety/libvirt,jfehlig/libvirt,eskultety/libvirt,nertpinx/libvirt,jardasgit/libvirt,libvirt/libvirt,jfehlig/libvirt,libvirt/libvirt,crobinso/libvirt,libvirt/libvirt,nertpinx/libvirt,jardasgit/libvirt,olafhering/libvirt,eskultety/libvirt,jfehlig/libvirt,jardasgit/libvirt,olafhering/libvirt,fabianfreyer/libvirt,zippy2/libvirt,eskultety/libvirt,olafhering/libvirt,eskultety/libvirt,andreabolognani/libvirt,zippy2/libvirt,nertpinx/libvirt