LU-3963 obdclass: convert to linux list api

LU-3963 obdclass: convert to linux list api

Move from the cfs_[h]list api to the native linux api for
all the code related to obdclass.

Change-Id: Id773b6c83b22cac5b210b6d41b470a2c8d6e206d
Signed-off-by: James Simmons <uja.ornl@gmail.com>
Reviewed-on: http://review.whamcloud.com/10525
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Nathaniel Clark <nathaniel.l.clark@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>