LU-9855 obdclass: Code cleanup

LU-9855 obdclass: Code cleanup

Remove uuid.c, and rewrite class_uuid_unparse
Remove always-on #defines and #ifdefs
Unwrap DECLARE_LU_VARS and remove #define
Rewrite CL_ENV_INC and DEC
Rewrite cs_page_inc/dec and cs_pagestate_inc/dec
Unwrap lustre_(get|put)_group_info #defines
Remove D_KUC #define

Signed-off-by: Ben Evans <bevans@cray.com>
Change-Id: I1ebaa47dbf749cedcf3d33028906a35caf7db694
Reviewed-on: https://review.whamcloud.com/28458
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: Patrick Farrell <paf@cray.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>