GetOrAddNetworkNamespace returns the namespace found by `id` or creates a new one and assigns `id.

RemoveNetworkNamespace removes the in-memory `namespace` found by `id`.

UVMContainerID is the ContainerID that will be sent on any prot.MessageBase for V2 where the specific message is targeted at the UVM itself.

Host is the structure tracking all UVM host state including all containers and processes.