bpf, selftests: Test BPF_FLOW_DISSECTOR_CONTINUE

The dissector program returns BPF_FLOW_DISSECTOR_CONTINUE (and avoids
setting skb->flow_keys or last_dissection map) in case it encounters
IP packets whose (outer) source address is 127.0.0.127.

Additional test is added to prog_tests/flow_dissector.c which sets
this address as test's pkk.iph.saddr, with the expected retval of
BPF_FLOW_DISSECTOR_CONTINUE.

Also, legacy test_flow_dissector.sh was similarly augmented.

Signed-off-by: Shmulik Ladkani <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Reviewed-by: Stanislav Fomichev <[email protected]>
Acked-by: John Fastabend <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

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