[PATCH 1/2] [Trusty][SRU](upstream) Clean up scsi error messages

[Dave Chiluk]

See https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1449372

There are three commits in play here
ee60b2c52e -  [SCSI] Add timeout to avoid infinite command retry 
and
e6c11dbb8d - scsi_lib: remove the description string in scsi_io_completion()

I included ee60b2c52e because it's short obvious, and allows e6c11dbb8d to be
cleanly cherry-picked. This patch is only necessary on Trusty as it already
exists on utopic+

e6c11dbb8d, solves part of the issue by removing some
of the error messages altogether.


9e5ed2a5b3 - scsi: use external buffer for command logging
9e5ed2a5b3, I did not include, but wanted to bring up.  It does not cleanly
cherry-pick, and it appears to have numerous dependencies in order to get
there.  However, it does seem to actually be the real fix for this problem.
Please review it and let me know if you agree with my assessment it probably
doesn't qualify for an SRU.

Thanks,
Dave.