LU-2675 lustre: remove linux/obd_class.h

LU-2675 lustre: remove linux/obd_class.h

Move some obdo handling declarations from
lustre/include/linux/obd_class.h to lustre/include/obd_class.h. Remove
lustre/include/linux/obd_class.h.

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Change-Id: I1e04c97ec7f4bb97b23f57298f52f5efd2c576a2
Reviewed-on: http://review.whamcloud.com/11505
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: frank zago <fzago@cray.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: James Simmons <uja.ornl@gmail.com>