Add tests for cases of ARP failures on TCP connect
Add tests for cases of ARP failures on TCP connect

Also fix test expectation for UDP sendto() case in tuntap syscall test.

Fixes #5155

PiperOrigin-RevId: 352056612

google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor