LU-8066 obdclass : Add infrastructure for procfs to sysfs migration

LU-8066 obdclass : Add infrastructure for procfs to sysfs migration

Prepare for procfs to sysfs migration

Add necessary plumbing to register obd types and instances
under /sys/fs/lustre

Linux-commit : 9b8013023cb62360b56c04313687e93a1c2bf3d6

Move common obd proc files to sysfs

This moves uuid display and also underlying fs statistics.

Linux-commit : 0bc36cb06e4bc5e936f2f442535daf557c7a4200

Change-Id: Ieb4e2f60c7003d658126beac071c05f94fa8eab8
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-on: https://review.whamcloud.com/26020
Tested-by: Jenkins
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Niu Yawei <yawei.niu@intel.com>
Reviewed-by: Fan Yong <fan.yong@intel.com>