LU-8066 ofd: migrate from proc to sysfs

LU-8066 ofd: migrate from proc to sysfs

Move the ofd module from using proc for most single value files
to sysfs. Leave the more complex proc entries for now. Migrate
the sysfs and most of the proc handling to lproc_ofd.c.

Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Change-Id: Ief21636a0dce3fd4946f9a6971a8b09c2812200e
Reviewed-on: https://review.whamcloud.com/33059
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Sonia Sharma <sharmaso@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>