Backends nft and ipvs can't handle hairpin

[uablrek]

K8s e2e-test;

[sig-network] Services should allow pods to hairpin back to themselves through services
# (suggested FOCUS='.*hairpin.back.to.themselves.*')

This test fails for backends;

• nft
• ipvs

but succeeds for backends iptables, ebpf and userspacelin.