* Remove federation
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Rebuild and point to github.com/coredns/federation
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Export `localNodeName` => `LocalNodeName`, to be used by federation (until deprecation)
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Remove plugin/kubernetes/federation.go (=> kubernetes/federation repo)
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Update github.com/coredns/federation
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* sticker-ci fix
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>