neigh: Make the IPv4 neighbor discovery runtime test more robust
neigh: Make the IPv4 neighbor discovery runtime test more robust

Use similar readiness check in the IPv4 neighbor discovery on neigh entry
state as we do in our IPv6 neighbor discovery test. Reason is that states
might be 'flaking' between REACHABLE and DELAY/PROBE if ongoing probes were
triggered. Also for Delete events, we don't need to know the NUD state.

Signed-off-by: Daniel Borkmann <3d0f3b9ddcacec30c4008c5e030e6c13a478cb4f@iogearbox.net>

cilium/cilium,michi-covalent/cilium,cilium/cilium,michi-covalent/cilium,cilium/cilium,michi-covalent/cilium,michi-covalent/cilium,cilium/cilium,michi-covalent/cilium,cilium/cilium