ipam: Treat inability to allocate internal IP as fatal error
ipam: Treat inability to allocate internal IP as fatal error

When the node internal IP is part of the allocation range, it must be reserved
in the allocation range and may not be used as an endpoint IP. When the
allocation to reserve the IP fails, the agent must quit as it risks to to
allocate it for an endpoint and thus creating an IP conflict.

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

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