Fixing ExternalIP address duplication bug

[preved911]

Hello. This PR should fix bug with updating node status addresses field. Right now I am getting error message like this:

yandex-cloud-controller-manager-7zsww yandex-cloud-controller-manager E0128 21:22:57.074080       1 node_controller.go:363] Error patching node with cloud ip addresses = [failed to patch status "{\"status\":{\"addresses\":[{\"address\":\"10.0.2.21\",\"type\":\"InternalIP\"},{\"address\":\"x.x.x.x\",\"type\":\"ExternalIP\"},{\"address\":\"x.x.x.x\",\"type\":\"ExternalIP\"},{\"address\":\"infr-master-ru-central1-c-0\",\"type\":\"Hostname\"},{\"$patch\":\"replace\"}]}}" for node "infr-master-ru-central1-c-0": Node "infr-master-ru-central1-c-0" is invalid: status.addresses[2]: Duplicate value: core.NodeAddress{Type:"ExternalIP", Address:"x.x.x.x"}]

P.S.: ExternalIP address value replaced by x.x.x.x string for security reason.