Merge remote-tracking branch 'remotes/ericb/tags/pull-bitmaps-2020-05-26-v3' into...

bitmaps patches for 2020-05-26

- fix non-blockdev migration of bitmaps when mirror job is in use
- add bitmap sizing to 'qemu-img measure'
- add 'qemu-img convert --bitmaps'

# gpg: Signature made Thu 28 May 2020 19:16:47 BST
# gpg:                using RSA key 71C2CC22B1C4602927D2F3AAA7A16B4A2527436A
# gpg: Good signature from "Eric Blake <eblake@redhat.com>" [full]
# gpg:                 aka "Eric Blake (Free Software Programmer) <ebb9@byu.net>" [full]
# gpg:                 aka "[jpeg image of size 6874]" [full]
# Primary key fingerprint: 71C2 CC22 B1C4 6029 27D2  F3AA A7A1 6B4A 2527 436A

* remotes/ericb/tags/pull-bitmaps-2020-05-26-v3:
  iotests: Add test 291 to for qemu-img bitmap coverage
  qemu-img: Add convert --bitmaps option
  qemu-img: Factor out code for merging bitmaps
  qcow2: Expose bitmaps' size during measure
  iotests: Fix test 178
  migration: forbid bitmap migration by generated node-name
  migration: add_bitmaps_to_list: check disk name once
  iotests: 194: test also migration of dirty bitmap
  migration: fix bitmaps pre-blockdev migration with mirror job
  block/dirty-bitmap: add bdrv_has_named_bitmaps helper
  migration: refactor init_dirty_bitmap_migration

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