LU-9166 mdt: Add trailing newlines to proc files

LU-9166 mdt: Add trailing newlines to proc files

Adds trailing newlines to two proc files.  A new sanity test ensures
that all non-empty readable proc files end with a newline.

Test-Parameters: trivial
Signed-off-by: Steve Guminski <stephenx.guminski@intel.com>
Change-Id: Id65dd5a43edc41be9f572d476b38975f0144fbaf
Reviewed-on: https://review.whamcloud.com/25977
Tested-by: Jenkins
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>