iscsi update for 2.6.25

This patchset was made over scsi-rc-fixes (it also applies to Linus's git
tree). It will not apply over scsi-misc, because there are some patches
which went into scsi-rc-fixes/2.6.24-rc4 and scsi-misc has not been updated
for the scsi-rc-fixes patches.

Sorry for the bigger than normal update. There are patches from Olaf and
Boaz which do the following:

- Rewrite iscsi_tcp data path (from Olaf), so we do not have two ulgy
abstractions for the send and recv path. Now we have one nice iscsi_segment
struct that works for both paths.
- Add basic iscsi spec handling we will need for Bidi support (from Boaz).
This does not add bidi support. It just adds code that is common.
- Device reset support. Some clustering software needed at least
device reset support, so I cleaned up that code and added device
logical unit reset support. I will add warm target reset support
later.
- Lots of fixes for things like shutdown, r2t leaks, and lots of clean
up from Olaf.
- sg chaining support.


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