Add reflected-packet based data tests

This commit adds tests that reflect outgoing packets, flipping the outer
src/dst headers to avoid the need to tear down and rebuild the outer
TUN.

This allows us to at least test that our implementation can interoperate
with itself.

Bug: 72950854
Test: this, passing
Change-Id: Ia969f78f4c1a0c0a017f5aad425a68852ff4433a
1 file changed
tree: a072cf1a90171960844e0630c66dde71bff42a3a
  1. tests/