crypto: testmgr - unify the AEAD encryption and decryption test vectors

Currently testmgr has separate encryption and decryption test vectors
for AEADs.  That's massively redundant, since usually the decryption
tests are identical to the encryption tests, just with the input/result
swapped.  And for some algorithms it was forgotten to add decryption
test vectors, so for them currently only encryption is being tested.

Therefore, eliminate the redundancy by removing the AEAD decryption test
vectors and updating testmgr to test both AEAD encryption and decryption
using what used to be the encryption test vectors.  Naming is adjusted
accordingly: each aead_testvec now has a 'ptext' (plaintext), 'plen'
(plaintext length), 'ctext' (ciphertext), and 'clen' (ciphertext length)
instead of an 'input', 'ilen', 'result', and 'rlen'.  "Ciphertext" here
refers to the full ciphertext, including the authentication tag.

For now the scatterlist divisions are just given for the plaintext
length, not also the ciphertext length.  For decryption, the last
scatterlist element is just extended by the authentication tag length.

In total, this removes over 5000 lines from testmgr.h, with no reduction
in test coverage since prior patches already copied the few unique
decryption test vectors into the encryption test vectors.

The testmgr.h portion of this patch was automatically generated using
the following awk script, except that I also manually updated the
definition of 'struct aead_testvec' and fixed the location of the
comment describing the AEGIS-128 test vectors.

    BEGIN { OTHER = 0; ENCVEC = 1; DECVEC = 2; DECVEC_TAIL = 3; mode = OTHER }

    /^static const struct aead_testvec.*_enc_/ { sub("_enc", ""); mode = ENCVEC }
    /^static const struct aead_testvec.*_dec_/ { mode = DECVEC }
    mode == ENCVEC {
        sub(/\.input[[:space:]]*=/,     ".ptext\t=")
        sub(/\.result[[:space:]]*=/,    ".ctext\t=")
        sub(/\.ilen[[:space:]]*=/,      ".plen\t=")
        sub(/\.rlen[[:space:]]*=/,      ".clen\t=")
        print
    }
    mode == DECVEC_TAIL && /[^[:space:]]/ { mode = OTHER }
    mode == OTHER                         { print }
    mode == ENCVEC && /^};/               { mode = OTHER }
    mode == DECVEC && /^};/               { mode = DECVEC_TAIL }

Note that git's default diff algorithm gets confused by the testmgr.h
portion of this patch, and reports too many lines added and removed.
It's better viewed with 'git diff --minimal' (or 'git show --minimal'),
which reports "2 files changed, 1235 insertions(+), 6491 deletions(-)".
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>