fix and simplify session shutdown V2

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Hi Nic,

This series rewrites the session shutdown code so that it is a lot simpler
in the core, doesn't rewrite boilerplat code in the fabrics drivers, and
avoids a race window between session shutdown and unregistration for
Below is receipt from Bart that he used to reproduce the session shutdown
races:

-------- snip --------
* Load the LIO core and ib_srpt kernel modules.
* Configure LIO such that a RAM disk was exported through ib_srpt.
* On the same system, using IB loopback, start srp_daemon such that the
  SRP initiator logs in.
* Add support for LIO LUNs to /etc/multipath.conf with queue_if_no_path
  enabled.
* Start multipath.
* On top of the multipath device that was created for the LIO LUN,
  create a filesystem.
* Run a fio data integrity test on top of that filesystem.
* While fio was running, unload and reload LIO + ib_srpt every 30s.
* Check that the fio IOPS drop to zero while LIO + ib_srpt were being
  restarted.
-------- snip --------

Changes since V1:
 - split out the iSCSI patch to provide a better changelog.  No changes
   to the final code


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