cam patch: reducing logging output for 'normal' failures

[Bruce Cran]

Hi,

I came across http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/119668
which contains a patch to reduce the verbosity of output from the cam
subsystem. cam has a tendancy to be a bit spammy when it 
comes across fairly normal situations such as the tray having been left 
open, or there just not being a disc present. For example:

(probe0:umass-sim0:0:0:0): TEST UNIT READY. CDB: 0 0 0 0 0 0 
(probe0:umass-sim0:0:0:0): CAM status: SCSI Status Error
(probe0:umass-sim0:0:0:0): SCSI status: Check Condition
(probe0:umass-sim0:0:0:0): SCSI sense: NOT READY asc:3a,1 (Medium not present - tray closed)
cd0 at umass-sim0 bus 0 scbus9 target 0 lun 0
cd0: <DVDRW USB H16X B02T> Removable CD-ROM SCSI-0 device 
cd0: 40.000MB/s transfers
cd0: Attempt to query device size failed: NOT READY, Medium not present
- tray closed

The first message, "Medium not present - tray closed" is unnecessary 
since it's repeated a few lines later and can look as though 
there's a real problem. I've attached an updated patch which adds the 
the tray open warning too.

Any comments?

-- 
Bruce Cran
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