Revert "provisioner/kubernetes: simplify internal address priority using sort.SliceStable"
Revert "provisioner/kubernetes: simplify internal address priority using sort.SliceStable"

This reverts commit 630aef3c7644390e13192a2d760ca5e5d7fe74a6.

tsuru/tsuru,tsuru/tsuru,tsuru/tsuru,tsuru/tsuru