Merge branch 'tc-gred-json-perf-vq-config' into iproute2-next

Jakub Kicinski  says:

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This set brings GRED support up to date with recent kernel changes.
In particular the new netlink attributes for more fine-grained stats
and per-virtual queue flags.

To make GRED usable in modern deployments the patch set starts with
adding JSON output.

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