LU-1201 checksum: add libcfs crypto hash

LU-1201 checksum: add libcfs crypto hash

Add libcfs crypto hash and cleanup all lustre hash checksumming.
Now lustre hash calculations base on linux kernel crypto api for kernel,
and base on libcfs crypto implementation for userlevel. So any improvement
at linux kernel for hashes would improve lustre.

Signed-off-by: Alexander Boyko <alexander_boyko@xyratex.com>
Reviewed-by: Alexey Lyashkov <alexey_lyashkov@xyratex.com>
Reviewed-by: Alexander Zarochentsev <alexander_zarochentsev@xyratex.com>
Xyratex-bug-id: MRP-337, MRP-471
Change-Id: I2fbf0f4d0c8ce7e7c3c7ea411c6ccd9dcfc7e03a
Reviewed-on: http://review.whamcloud.com/3098
Tested-by: Hudson
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>