LU-8602 libcfs: call proper crypto algo when keys are passed in

LU-8602 libcfs: call proper crypto algo when keys are passed in

In most cases keys are not passed to cfs_crypto_hash_alloc()
but if they are then crypto_ahash_setkey() will fail. Keys
are only handled by the hmac version of the algorithm requested.
If a key is passed into cfs_crypto_hash_alloc() then we should
request the hmac version of the algorithm when calling
crypto_alloc_ahash().

Change-Id: I080d89bc864b236524ef11f50df41b750ecab9fe
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-on: https://review.whamcloud.com/25199
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Sebastien Buisson <sbuisson@ddn.com>
Reviewed-by: Alexandr Boyko <c17825@cray.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>