changelog: updates since 16.06

Changelog

=========

Upcoming release

----------------

- NVMe

  - The Weighted Round Robin arbitration method is now supported. This allows

    the user to specify different priorities on a per-I/O-queue basis.  To

    enable WRR, set the `arb_mechanism` field during `spdk_nvme_probe()`.

  - A simplified "Hello World" example was added to show the proper way to use

    the NVMe library API; see `examples/nvme/hello_world/hello_world.c`.

- NVMe over Fabrics

  - The configuration file format was changed, which will require updates to

    any existing nvmf.conf files (see `etc/spdk/nvmf.conf.in`):

    - `SubsystemGroup` was renamed to `Subsystem`.

    - `AuthFile` was removed (it was unimplemented).

    - `nvmf_tgt` was updated to correctly recognize NQN (NVMe Qualified Names)

      when naming subsystems.  The default node name was changed to reflect this;

      it is now "nqn.2016-06.io.spdk".

  - Many bug fixes and cleanups were applied to the `nvmf_tgt` app and library.

v16.06: NVMf userspace target

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