Merge remote-tracking branch 'remotes/ericb/tags/pull-nbd-2021-06-15-v2' into staging

nbd patches for 2021-06-15

- bug fixes in coroutine aio context handling
- rework NBD client connection logic to perform more work in coroutine

# gpg: Signature made Fri 18 Jun 2021 18:29:39 BST
# gpg:                using RSA key 71C2CC22B1C4602927D2F3AAA7A16B4A2527436A
# gpg: Good signature from "Eric Blake <eblake@redhat.com>" [full]
# gpg:                 aka "Eric Blake (Free Software Programmer) <ebb9@byu.net>" [full]
# gpg:                 aka "[jpeg image of size 6874]" [full]
# Primary key fingerprint: 71C2 CC22 B1C4 6029 27D2  F3AA A7A1 6B4A 2527 436A

* remotes/ericb/tags/pull-nbd-2021-06-15-v2: (34 commits)
  block/nbd: safer transition to receiving request
  block/nbd: add nbd_client_connected() helper
  block/nbd: reuse nbd_co_do_establish_connection() in nbd_open()
  nbd/client-connection: add option for non-blocking connection attempt
  block/nbd: split nbd_co_do_establish_connection out of nbd_reconnect_attempt
  block-coroutine-wrapper: allow non bdrv_ prefix
  nbd/client-connection: return only one io channel
  block/nbd: drop BDRVNBDState::sioc
  block/nbd: don't touch s->sioc in nbd_teardown_connection()
  block/nbd: use negotiation of NBDClientConnection
  block/nbd: split nbd_handle_updated_info out of nbd_client_handshake()
  nbd/client-connection: shutdown connection on release
  nbd/client-connection: implement connection retry
  nbd/client-connection: add possibility of negotiation
  nbd/client-connection: use QEMU_LOCK_GUARD
  nbd: move connection code from block/nbd to nbd/client-connection
  block/nbd: introduce nbd_client_connection_release()
  block/nbd: introduce nbd_client_connection_new()
  block/nbd: rename NBDConnectThread to NBDClientConnection
  block/nbd: make nbd_co_establish_connection_cancel() bs-independent
  ...

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

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