agent: Ignore IPV4_GATEWAY=0x0 when restoring
agent: Ignore IPV4_GATEWAY=0x0 when restoring

I ended up with a node_config.h where IPV4_GATEWAY is set to 0x0. This causes
the internalIP to be restored to 0.0.0.0 which causes the agent to refuse
to start up and recover. It is better to continue and attempt to recover from
the IP assigned to the cilium_host device.

Signed-off-by: Thomas Graf <5f50a84c1fa3bcff146405017f36aec1a10a9e38@cilium.io>

michi-covalent/cilium,tgraf/cilium,cilium-team/cilium,tklauser/cilium,tklauser/cilium,scanf/cilium,tklauser/cilium,tgraf/cilium,cilium/cilium,cilium-team/cilium,tgraf/cilium,scanf/cilium,scanf/cilium,michi-covalent/cilium,tgraf/cilium,cilium/cilium,tklauser/cilium,michi-covalent/cilium,cilium/cilium,scanf/cilium,scanf/cilium,cilium/cilium,tgraf/cilium,scanf/cilium,tklauser/cilium,scanf/cilium,tgraf/cilium,cilium/cilium,michi-covalent/cilium,michi-covalent/cilium