linux-phytec-ti

bpf, selftests: delete xfrm tunnel when test exits.

Make the printting of bpf xfrm tunnel better and
cleanup xfrm state and policy when xfrm test finishes.

Signed-off-by: William Tu <u9012063@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>