Yet more patches -current

[Sean Bruno]

This update continues my stabilization work.

Change default sysctl valut of hold_count to 0.  I see no legitimate
reason
to keep a firewire device around if it dissapears from the bus.

As in previous changesets, enhance printfs where possible with the
calling
function and the device via device_printf.

Allow the Self-ID packet to be displayed when firewire_debug is set.
Very
useful.

Squash bug related to speed negotiation.
Scenario:  a 400/800 drive is connected to a 400/800 PC via the 400
speed connections.
Existing code breaks as it trys to use 800 over the 400 link.
Problem:  Firewire doesn't correlate a lun to a specific physical link
between 2 nodes.(the drive and the PC).
Solution:  Try fastest speed first, if that fails, step down one notch
and
retry.  repeat.

Attempt Pre-1394a-2000 spec detection of bus speed via the Bus Info
Block.



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