The code for handling batches is largely the same across iproute2 tools.
Extract a helper to handle the batch, and adjust the tools to dispatch to
this helper. Sandwitch the invocation between prologue / epilogue code
specific for each tool.
Signed-off-by: Petr Machata <me@pmachata.org>
Signed-off-by: David Ahern <dsahern@gmail.com>
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