update code.goole.com/p/go.net to golang.org/x/net
update code.goole.com/p/go.net to golang.org/x/net

https://groups.google.com/forum/#!topic/golang-nuts/eD8dh3T9yyA

Kubernetes-commit: 4e95104953254142ba8ad13314a60a2e9fe60fca

kubernetes/api