Merge remote-tracking branch 'remotes/berrange/tags/qcrypto-next-pull-request' into...

Improve performance of XTS cipher mode impl

The XTS cipher mode performance is approximately doubled and test
coverage is improved.

# gpg: Signature made Wed 24 Oct 2018 19:05:08 BST
# gpg:                using RSA key BE86EBB415104FDF
# gpg: Good signature from "Daniel P. Berrange <dan@berrange.com>"
# gpg:                 aka "Daniel P. Berrange <berrange@redhat.com>"
# Primary key fingerprint: DAF3 A6FD B26B 6291 2D0E  8E3F BE86 EBB4 1510 4FDF

* remotes/berrange/tags/qcrypto-next-pull-request:
  crypto: add testing for unaligned buffers with XTS cipher mode
  crypto: refactor XTS cipher mode test suite
  crypto: annotate xts_tweak_encdec as inlineable
  crypto: convert xts_mult_x to use xts_uint128 type
  crypto: convert xts_tweak_encdec to use xts_uint128 type
  crypto: introduce a xts_uint128 data type
  crypto: remove code duplication in tweak encrypt/decrypt
  crypto: expand algorithm coverage for cipher benchmark

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>