iSCSI variable DataPDULength

["Julian Satran" <Julian_Satran@il.ibm.com>]

Dear colleagues,

We will accommodate variable DataPDULength (and different in the two directions) between connections and during connection life.
The change will require a stricter behavior on task reassign  and recovery to a connection with lower PDUlength - SACK if any will have to be issued with "send me all" (run length 0) and on reassign we will have to give (probably) the buffer offset
of the last received data-piece. Nothing else seems to be affected.

We will send out the text of the changes soon.

Julo