LU-4563 Fix unsafe userspace access in many proc files

LU-4563 Fix unsafe userspace access in many proc files

Also add a test to make sure no new ones are added in the future

Change-Id: I2fe7d2cea5daef21f4279ce813ca35f6d91f68dc
Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>
Reviewed-on: http://review.whamcloud.com/9059
Tested-by: Jenkins
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Simmons <uja.ornl@gmail.com>