Make CBC decoding constant time.
This patch makes the decoding of SSLv3 and TLS CBC records constant time. Without this, a timing side-channel can be used to build a padding oracle and mount Vaudenay's attack. This patch also disables the stitched AESNI+SHA mode pending a similar fix to that code. In order to be easy to backport, this change is implemented in ssl/, rather than as a generic AEAD mode. In the future this should be changed around so that HMAC isn't in ssl/, but crypto/ as FIPS expects. (cherry picked from commit e130841b) Conflicts: crypto/evp/c_allc.c ssl/ssl_algs.c ssl/ssl_locl.h ssl/t1_enc.c (cherry picked from commit 3622239826698a0e534dcf0473204c724bb9b4b4) Conflicts: ssl/d1_enc.c ssl/s3_enc.c ssl/s3_pkt.c ssl/ssl3.h ssl/ssl_algs.c ssl/t1_enc.c
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