Revert "LU-5810 tests: add client hostname to lctl mark"

Revert "LU-5810 tests: add client hostname to lctl mark"

Adding hostname to individual lines in test logs broke autotest's
parsing of logs and resulted in no console logs being uploaded to
Maloo. In addition, the way that we added hostname to the log
output was nosier than expect and needs to be reworked.

This reverts commit 9c4156e6fc146a198bb342e28eb246f1076889bd.

Change-Id: I6d7c38fd37edc975bc4f5e1ff5c825d4899af474
Signed-off-by: James Nunez <james.a.nunez@intel.com>
Reviewed-on: http://review.whamcloud.com/20894
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Tested-by: Oleg Drokin <oleg.drokin@intel.com>