LU-8837 obd: remove linux directory

LU-8837 obd: remove linux directory

With only two files in obdclass/linux we can move the code around.
Rename linux-obdo.c to obdo_server.c since its only server code.
Move the ioctl handling in linux-module.c to class_obd.c and
rename linux-module.c to obd_sysfs.c since it only contains sysfs/
debugfs code.

Test-Parameters: trivial

Change-Id: Ie4b99cf37f83158f9d43eb38c971c1602f805c6f
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-on: https://review.whamcloud.com/32100
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>