Merge remote-tracking branch 'kwolf/for-anthony' into staging

# By Max Reitz (10) and others
# Via Kevin Wolf
* kwolf/for-anthony: (30 commits)
  qcow2: Remove useless count_contiguous_clusters() parameter
  qcow2: COMPRESSED on count_contiguous_clusters
  qcow2: count_contiguous_clusters and compression
  qcow2: Free only newly allocated clusters on error
  qcow2: Always use error path in l2_allocate
  qcow2: Don't put invalid L2 table into cache
  qemu-iotests: Preallocated zero clusters in 061
  qcow2: Correct bitmap size in zero expansion
  qemu-iotests: Quote $TEST_IMG* and $TEST_DIR usage
  qemu-iotests: Add basic ability to use binary sample images
  qemu-iotests: fix qmp.py search path
  block: use DIV_ROUND_UP in bdrv_co_do_readv
  qcow2: Assert against currently impossible overflow
  block: qed - use QEMU_PACKED for on-disk structures
  block: qcow2 - used QEMU_PACKED for on-disk structures
  block: vpc - use QEMU_PACKED for on-disk structures
  block: vdi - use QEMU_PACKED for on-disk structures
  rbd: avoid qemu_rbd_snap_list() memory leaks
  qdict: Extract qdict_extract_subqdict
  block: Fix compiler warning (-Werror=uninitialized)
  ...

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