CAM_NEW_TRAN- kernel changes ready for review

[Matthew Jacob]

http://people.freebsd.org/~mjacob/DIFFS.CAM_NEW_TRAN_CODE

This covers all the kernel changes. I did not do bug fixing or code
correction while I was at it (with a couple of obvious fixes that were
just glaringly wrong). So, if the
XPT_GET_TRAN_SETTINGS/XPT_SET_TRAN_SETTINGS code in each SIM was not
perfect before, it's still not perfect now.

This did a LINT+CAM_NEW_TRAN_CODE compile and I'll do some actual h/w
checking too.

There's a slightly narsty issue with camlib and camcontrol's usage of
XPT_GET_TRAN_SETTINGS- *it* doesn't know about this change. I'm of two
minds about this- whether to just live with the breakage (which will
mean old camcontrol and other users of camlib won't work quite right),
or to make the letdown somewhat gentler by doing a slight reorg of the
new tran_settings structure and the enum for 'type' so that
CAM_NEW_TRAN_CODE will just coincidentally end up with identical usage
to old binaries.

If all who are interested could, please review this and send comments
back within a couple of days as I don't want this to stall (this is
also a window of time I have for working on this- partly for work in
doing Domain Validation, but also partly because one of my consulting
gigs collapsed and I have a couple of days spare while I'm ramping up
others).