LU-11750 krb5: krb5int_derive_key has 'hash' extra parameter

LU-11750 krb5: krb5int_derive_key has 'hash' extra parameter

From Kerberos 5 release 1.15, and introduction of support of
aes-sha2, krb5int_derive_key() groks an additional 'hash' parameter.

Signed-off-by: Sebastien Buisson <sbuisson@ddn.com>
Change-Id: I7c6ea5ac2d6844371b254b7361d28c462afe5afa
Reviewed-on: https://review.whamcloud.com/33817
Tested-by: Jenkins
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Jeremy Filizetti <jeremy.filizetti@gmail.com>
Reviewed-by: Li Dongyang <dongyangli@ddn.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>