Allow qemu-img to show information about bitmaps stored in qcow2 images.

v2:
- Remove bitmap manipulation command in favor of a part 2 series later
- Responded to much of Vladimir's feedback (Thank you!);
  - In particular, make sure IN_USE bitmaps cannot be remounted RW.
  - Fixed semantics of the extra_data flag

John Snow (10):
  qcow2/bitmap: remove redundant arguments from bitmap_list_load
  qcow2/bitmap: avoid adjusting bm->flags for RO bitmaps
  qcow2/bitmap: cache bm_list
  qcow2/bitmap: cache loaded bitmaps
  qcow2/bitmap: reject IN_USE bitmaps on rw reload
  qcow2/bitmap: load IN_USE bitmaps if disk is RO
  qcow2/bitmap: track bitmap type
  qcow2/bitmap: track extra_data_size
  qapi: add bitmap info
  qcow2/bitmap: add basic bitmaps info

 block/qcow2-bitmap.c | 276 ++++++++++++++++++++++++++++++++++-----------------
 block/qcow2.c        |   9 ++
 block/qcow2.h        |   3 +
 qapi/block-core.json |  64 +++++++++++-
 4 files changed, 260 insertions(+), 92 deletions(-)

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2.14.3