iscsi features bugfixes

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The following patches were made against scsi-misc. They contain fixes
and features including:

- Features:
1. Export sysfs values needed for OF/BIOS assisted iscsi boot.
2. Export sysfs values needed to be able to bind sessions to
a hba/port/NIC/netdev. This is needed for software iscsi so it can
bind a session to a netdevice and qla4xxx so it can bind sessions to 
a specific port, and will be used for broadcom management.
3. Add a host level set param event that works like the session level
one, so for qla4xxx we can set port values like ip address or
initiator name.
4. Not a feature, but some cleanups that are needed for bidi, but
are nice cleanups on their own.

- Fixes
1.  The send state machine was calculating the header wrong
when partially sending headers.
2. The cmdsn allocation could allocation and pdu transmit code
were racing which caused targets to drop sessions.
3. The xmitmutex use and transmit code were starving the mgmt queue,
so noops would timeout waiting to be sent or queued
4. FDs were being leaked
5. Padding was assumed to be in the same skb as the data/header.
This is the simple fix. We are working on merging Olaf's recv
path rewrite for the next patchset.



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