The bpf folder didn't actual contain a test application, but instead
basic examples of BPF code for use with testpmd. Therefore we can
move it to the `examples` folder. Being different, it also needs
a README with it, explaining what it is and how to use it. References
to the code from the testpmd docs are suitably updated.
Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
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