iscsi: assert that sectors are aligned to LUN blocksize

iscsi: assert that sectors are aligned to LUN blocksize

if the blocksize of an iSCSI LUN is bigger than the BDRV_SECTOR_SIZE
it is possible that sector_num or nb_sectors are not correctly
aligned.

to avoid corruption we fail requests which are misaligned.

Signed-off-by: Peter Lieven <pl@kamp.de>
Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
(cherry picked from commit 91bea4e2bb1a5f7954a3b3a4f2e28e96bd25c458)

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>