LU-8066 llite: Move all remaining procfs entries to debugfs

LU-8066 llite: Move all remaining procfs entries to debugfs

This moves all remaining procfs handling in llite layer to debugfs.

This is a modified version of

Linux-commit : ae7c0f4833a65b7648cceaf1a60503a89e057f0f

Change-Id: Id5c411d21a660a17a015ca9976b857e6b088c28a
Signed-off-by: Dmitry Eremin <dmitry.eremin@intel.com>
Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-on: https://review.whamcloud.com/32517
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Ben Evans <bevans@cray.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>