new isp test code/24XX

[Matt Jacob]

In order to accomodate the 4Gb QLogic card, the isp driver has had to be
restructured in a pretty large way. The 24XX cards have the same rough
architecture as all the other QLogic cards, but have massively changed
inside (16 -> 32 bit registers; IOCBs that have same names and type
fields but different layouts).

Between this and the desire to make some changes that will make failover
and N-port virtualization in target mode easier to handle, loop and fabric
evaluation have also been rewritten (which also better accomodates the
2K port login f/w which is now standard even for 23XX cards). This is
a big change and needs some serious test time to get right.

The changes were so much that rather than impose this even on
-current, some settle time in the FreeBSD Perforce sandbox seemed
appropriate.

If anyone would like to beta test these changes, please let me know.
The more feedback now, the more painless the change later. The
perforce depot is //depot/client/newisp.

-matt