RECONNCT fix broken reconnect for iov out vectors

We where modifying out_offset and out_len in iscsi_write_to_socket().
If the packet that was being sent before reconnect was a write command
the was a significant change that out_offset and out_len where already
touched. When requeing the packet after reconnect we where
sending garbage!

Signed-off-by: Peter Lieven <pl@kamp.de>

include/iscsi-private.h

@@ -218,7 +218,8 @@ struct iscsi_pdu {
 
 	struct iscsi_data outdata; /* Header for PDU to send */
 	uint32_t out_offset;       /* Offset into data-out iovector */
-	uint32_t out_len;          /* Amount of data to sent */
+	uint32_t out_len;          /* Amount of data to sent starting at out_offset */
+	uint32_t out_written;      /* Number of bytes written to socket */
 
 	struct iscsi_data indata;