Merge remote-tracking branch 'remotes/famz/tags/block-and-testing-pull-request' into...

# gpg: Signature made Mon 17 Jul 2017 04:47:05 BST
# gpg:                using RSA key 0xCA35624C6A9171C6
# gpg: Good signature from "Fam Zheng <famz@redhat.com>"
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 5003 7CB7 9706 0F76 F021  AD56 CA35 624C 6A91 71C6

* remotes/famz/tags/block-and-testing-pull-request:
  travis: add no-TCG build
  docker.py: Improve subprocess exit code handling
  docker.py: Drop infile parameter
  docker: Don't enable networking as a side-effect of DEBUG=1
  ssh: support I/O from any AioContext
  sheepdog: add queue_lock
  qed: protect table cache with CoMutex
  qed: introduce bdrv_qed_init_state
  block: invoke .bdrv_drain callback in coroutine context and from AioContext
  qed: move tail of qed_aio_write_main to qed_aio_write_{cow, alloc}
  vvfat: make it thread-safe
  vpc: make it thread-safe
  vdi: make it thread-safe
  coroutine-lock: add qemu_co_rwlock_downgrade and qemu_co_rwlock_upgrade
  qcow2: call CoQueue APIs under CoMutex

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