Merge remote-tracking branch 'mreitz/tags/pull-block-2017-11-21' into queue-block

Block patches for 2.11.0-rc2

# gpg: Signature made Tue Nov 21 14:54:28 2017 CET
# gpg:                using RSA key F407DB0061D5CF40
# gpg: Good signature from "Max Reitz <mreitz@redhat.com>"
# Primary key fingerprint: 91BE B60A 30DB 3E88 57D1  1829 F407 DB00 61D5 CF40

* mreitz/tags/pull-block-2017-11-21:
  iotests: Fix 176 on 32-bit host
  block: Close a BlockDriverState completely even when bs->drv is NULL

Signed-off-by: Kevin Wolf <kwolf@redhat.com>