We shouldn't use node names as addresses

[This line in strategy.go](https://github.com/kubernetes/kubernetes/blob/master/pkg/registry/pod/strategy.go#L262) is causing problems for PR #17643. We tried to purge all uses of node names as addresses in #2462, but this one came back in in #6985. It looks like there are some TLS concerns that caused us to punt, but we never came back to it.
