SUJ update

Hello,

I fixed a few SUJ bugs.  If those of you who reported one of the following 
bugs could re-test I would greatly appreciate it.

1)  panic on gnome start via softdep_cancel_link().
2)  Difficulty setting flags on /.  This can only be done from a direct 
boot into single user but there were problems with tunefs that could lead 
to the kernel and disk becoming out of sync with filesystem state.
3)  Kernel compiles without SOFTUPDATES defined in the config now work.

I have had some reports of a hang waiting on journal space with certain 
types of activity.  I have only had this reported twice and I am not able 
to reproduce no matter how much load I throw at the machine.  If you 
reproduce this please try to get a coredump or minidump.

Thanks,
Jeff