SCSI add support for POSIX compatible iovectos

This patch defines an scsi_iovec struct which is guaranteed
to be POSIX compatible. It furthermore adds support for
in+out iovectors for bi-directional operations
Signed-off-by: Peter Lieven <pl@kamp.de>

lib/init.c

@@ -32,7 +32,6 @@
 #include "iscsi.h"
 #include "iscsi-private.h"
 #include "slist.h"
-#include "scsi-lowlevel.h"
 
 
 inline void* iscsi_malloc(struct iscsi_context *iscsi, size_t size) {