net: parametrize skb_segment unit test to expand coverage

Expand the test with variants

- GSO_TEST_NO_GSO:      payload size less than or equal to gso_size
- GSO_TEST_FRAGS:       payload in both linear and page frags
- GSO_TEST_FRAGS_PURE:  payload exclusively in page frags
- GSO_TEST_GSO_PARTIAL: produce one gso segment of multiple of gso_size,
                        plus optionally one non-gso trailer segment

Define a test struct that encodes the input gso skb and output segs.
Input in terms of linear and fragment lengths. Output as length of
each segment.

Signed-off-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

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