Merge remote-tracking branch 'stefanha/block' into staging

# By Max Reitz (5) and others
# Via Stefan Hajnoczi
* stefanha/block:
  block: use correct filename
  qemu-iotests: Correct 026 output
  qcow2: Free allocated L2 cluster on error
  qcow2: Switch L1 table in a single sequence
  block: vhdx - add migration blocker
  block: use correct filename for error report
  qcow2: CHECK_OFLAG_COPIED is obsolete
  qcow2: Correct endianness in overlap check

Message-id: 1381145289-6591-1-git-send-email-stefanha@redhat.com
Signed-off-by: Anthony Liguori <anthony@codemonkey.ws>