neigh: Add runtime test for cleaning stale IPv4 nextHop addresses
neigh: Add runtime test for cleaning stale IPv4 nextHop addresses

Similar as we do for IPv6, add a test case which simulates agent resync where
the agent cleans up stale neighbor entries that we no longer track due to nodes
not being in cluster. Make sure that we also have IPv4 entries covered.

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

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