Updates to -current

[Sean Bruno]

Here is an update to -current that I am working on.

This update fixes the following:

SBP was not properly detaching from CAM if a target is powered off or
disconnected from the firewire bus.  This would manifest itself by
causing things like "camcontrol rescan all" to hang indefinitely.

SBP would have panic'd in sbp_orb_pointer() if fw_asyreq() failed.

Add locking during BUS_RESET conditions to keep the bus_reset handler
from firing before the code was finished asserting the BUS_RESET
condition.

Remove FWOHCI_INTFILT as the bus reset handler really does WAY more than
it should.  

Rework the generation indicator/flag to more properly adhere to the
specifications.  In this context, the generation flag should be 0 or 1
to indicate that the CROM has changed.  It should not be incremented
indefinitely without bounds.
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