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: NJiri Denemark <jdenemar@redhat.com>
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