Merge branch 'dcb-pfc-buffer-maxrate' into next

Petr Machata  says:
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Add support to the dcb tool for the following three DCB objects:

- PFC, for "Priority-based Flow Control", allows configuration of priority
  lossiness, and related toggles.

- DCBNL buffer interfaces are an extension to the 802.1q DCB interfaces and
  allow configuration of port headroom buffers.

- DCBNL maxrate interfaces are an extension to the 802.1q DCB interfaces
  and allow configuration of rate with which traffic in a given traffic
  class is sent.

Patches #1-#4 fix small issues in the current DCB code and man pages.

Patch #5 adds new helpers to the DCB dispatcher.

Patches #6 and #7 add support for command line arguments -s and -i. These
enable, respectively, display of statistical counters, and ISO/IEC mode of
rate units.

Patches #8-#10 add the subtools themselves and their man pages.

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Signed-off-by: David Ahern <dsahern@gmail.com>