Revert "LU-1346 libcfs: replace CFS_CAP_XXX with kernel definition"

Shadow raised pretty valid points about compatibility and wire protocol changes caused by this patch i LU-1346 comments, so reverting

This reverts commit b22fb817507ff52c02de38435fe90d758e852105

Change-Id: Ia0fcd279d17c9f996b2726e4bd5f115d1c629f49
Reviewed-on: http://review.whamcloud.com/7798
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Tested-by: Oleg Drokin <oleg.drokin@intel.com>