Merge r21120 from mskrb-integ

Refactor code such that an AEAD provider does not need to implement the
older, non-IOV SPIs. Instead, the older APIs will implement their
behaviour on top of the AEAD SPIs, using the wrapper functions in
aead.c.
https://github.com/krb5/krb5/commit/9ab3afbf9569254cf67bf7363cb9a50f549a5cdf
Commit By: hartmans



Revision: 21278
Changed Files:
U   trunk/src/lib/crypto/aead.c
U   trunk/src/lib/crypto/aead.h
U   trunk/src/lib/crypto/crypto_length.c
U   trunk/src/lib/crypto/decrypt.c
U   trunk/src/lib/crypto/encrypt.c
U   trunk/src/lib/crypto/encrypt_length.c