LU-2158 lvfs: move obdclass related functions to obclass

LU-2158 lvfs: move obdclass related functions to obclass

Currently a lot of functions exist in the lvfs layer
that really belongs to different parts of the stack.
This patch moves obdclass specific code that is located
in the lvfs layer into the proper location.

Signed-off-by: James Simmons <uja.ornl@gmail.com>
Change-Id: I5be4dede1afdbbc4af0157cbcd13a5133ce7a1db
Reviewed-on: http://review.whamcloud.com/5250
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>