Merge tag 'for-upstream' of https://gitlab.com/bonzini/qemu into staging

Merge tag 'for-upstream' of https://gitlab.com/bonzini/qemu into staging

* Fix and tests for -readconfig
* Fixes for changeable block size

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# gpg:                using RSA key F13338574B662389866C7682BFFBD25F78C7AE83
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# gpg: Good signature from "Paolo Bonzini <bonzini@gnu.org>" [undefined]
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* tag 'for-upstream' of https://gitlab.com/bonzini/qemu:
  tests/qtest: add scenario for -readconfig handling
  vl: remove dead code in parse_memory_options()
  vl: fix [memory] section with -readconfig
  scsi-disk: ensure block size is non-zero and changes limited to bits 8-15
  scsi-disk: fix overflow when block size is not a multiple of BDRV_SECTOR_SIZE

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>