Merge branch 'zbd'

* zbd:
  Add scripts for testing the fio zoned block device support code
  Add support for resetting zones periodically
  Make it possible to limit the number of open zones
  Collect and show zone reset statistics
  Add support for zoned block devices
  Add two assert statements in mark_random_map()
  Pass offset and buffer length explicitly to mark_random_map()
  Introduce the io_u.post_submit callback function pointer
  Add the zonemode job option
  Add the 'zbd' debug level
  configure: Add <linux/blkzoned.h> test