drop bio mode from null_blk and convert it to atomic queue limits v4

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Hi Jens,

sorry for spamming you twice in a day with this series, but the buildbot
decided to send me a delayed warning just after posting the previous
series, so I've fixed it up and resent.

this series drops the obsolete bio mode from the null_blk driver and
then converts the driver to pass the queue limits to blk_mq_alloc_disk.

Changes since v3:
 - fix the !BLK_DEV_ZONE compilation

Changes since v2:
 - rebase on top of the blk_alloc_disk prototype change

Changes since v1:
 - add an incremental from Damien to make sure the zoned tunable are
   properly taken into account

Diffstat:
 main.c     |  503 +++++++++++++++----------------------------------------------
 null_blk.h |   19 --
 trace.h    |    5 
 zoned.c    |   25 +--
 4 files changed, 139 insertions(+), 413 deletions(-)




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