Merge remote-tracking branch 'mreitz/tags/pull-block-2016-10-24' into queue-block

Block patches for master

# gpg: Signature made Mon Oct 24 17:56:44 2016 CEST
# gpg:                using RSA key 0xF407DB0061D5CF40
# 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-2016-10-24:
  block/replication: Clarify 'top-id' parameter usage
  block: More operations for meta dirty bitmap
  tests: Add test code for hbitmap serialization
  block: BdrvDirtyBitmap serialization interface
  hbitmap: serialization
  block: Assert that bdrv_release_dirty_bitmap succeeded
  block: Add two dirty bitmap getters
  block: Support meta dirty bitmap
  tests: Add test code for meta bitmap
  HBitmap: Introduce "meta" bitmap to track bit changes
  block: Hide HBitmap in block dirty bitmap interface
  quorum: do not allocate multiple iovecs for FIFO strategy
  quorum: change child_iter to children_read

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