Delete containers for a pod if we have to create the network container.

Closes https://github.com/GoogleCloudPlatform/kubernetes/issues/817
I moved the network container creation code around a little bit.  Basically now, if it fails to delete all containers, it won't create the network container, so it will try again the next time to delete all of the containers.

switched to -1 to make it clear that this is an error case and state is unknown.