Merge remote-tracking branch 'remotes/maxreitz/tags/pull-block-2020-11-09-v2' into staging

Block patches for 5.2.0-rc1:
- Some nvme fixes (addressing problems spotted by Coverity)
- Fix nfs compiling on mingw (and enable it in Cirrus)
- Fix an error path in bdrv_co_invalidate_cache() (permission update
  was initiated, but not aborted)
- Fix (on-error) roll back in bdrv_drop_intermediate(): Instead of
  inlining bdrv_replace_node() (wrongly), call that function
- Fix for iotest 240
- Fix error handling in bdrv_getlength()
- Be more explicit about how QCowL2Meta objects are handled
- Cleanups

# gpg: Signature made Mon 09 Nov 2020 17:45:06 GMT
# gpg:                using RSA key 91BEB60A30DB3E8857D11829F407DB0061D5CF40
# gpg:                issuer "mreitz@redhat.com"
# gpg: Good signature from "Max Reitz <mreitz@redhat.com>" [full]
# Primary key fingerprint: 91BE B60A 30DB 3E88 57D1  1829 F407 DB00 61D5 CF40

* remotes/maxreitz/tags/pull-block-2020-11-09-v2:
  block: make bdrv_drop_intermediate() less wrong
  block: add bdrv_replace_node_common()
  block: add forgotten bdrv_abort_perm_update() to bdrv_co_invalidate_cache()
  block: Fix some code style problems, "foo* bar" should be "foo *bar"
  block: Fix integer promotion error in bdrv_getlength()
  block: enable libnfs on msys2/mingw in cirrus.yml
  block: Fixes nfs compiling error on msys2/mingw
  iotests: rewrite iotest 240 in python
  iotests: add filter_qmp_virtio_scsi function
  hw/block/nvme: fix free of array-typed value
  hw/block/nvme: fix uint16_t use of uint32_t sgls member
  hw/block/nvme: fix null ns in register namespace
  qcow2: Document and enforce the QCowL2Meta invariants
  block: Move bdrv_drain_all_end_quiesce() to block_int.h
  block: Remove unused include

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

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