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

Misc crypto subsystem fixes

* Improve error message for large files when creating LUKS volumes
* Expand crypto hash benchmark coverage
* Misc code refactoring with no functional change

# gpg: Signature made Thu 07 May 2020 12:57:02 BST
# gpg:                using RSA key DAF3A6FDB26B62912D0E8E3FBE86EBB415104FDF
# gpg: Good signature from "Daniel P. Berrange <dan@berrange.com>" [full]
# gpg:                 aka "Daniel P. Berrange <berrange@redhat.com>" [full]
# Primary key fingerprint: DAF3 A6FD B26B 6291 2D0E  8E3F BE86 EBB4 1510 4FDF

* remotes/berrange/tags/qcrypto-next-pull-request:
  crypto: extend hash benchmark to cover more algorithms
  block: luks: better error message when creating too large files
  crypto: Redundant type conversion for AES_KEY pointer
  crypto/secret: fix inconsequential errors.
  crypto: fix getter of a QCryptoSecret's property

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