LU-4761 tests: clean up spurious messages and files

LU-4761 tests: clean up spurious messages and files

Reduce spurious messages that appear in the test and console logs
that are not useful for debugging, and just clutter things up.

Clean up a few files left over from tests.

Signed-off-by: Andreas Dilger <andreas.dilger@intel.com>
Change-Id: Ie17888a8f9c5864530dcb455a0cd4e51f83ebbe5
Reviewed-on: https://review.whamcloud.com/29012
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Jian Yu <jian.yu@intel.com>
Reviewed-by: Mike Pershin <mike.pershin@intel.com>
Reviewed-by: James Nunez <james.a.nunez@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>