Add support for getting node internal IP addresses in K8s 1.10.5+
Add support for getting node internal IP addresses in K8s 1.10.5+

In K8s 1.10.5 the internal addresses are no longer printed with
the 'kubectl get nodes -o wide' command. Rather, external IP
addresses are printed. This patch also retrieves the internal
IP address for each node via a custom format 'kubectl get nodes'
coomand.

rastislavszabo/vpp,milanlenco/vpp-1,rastislavszabo/vpp,rastislavszabo/vpp,brecode/vpp,rastislavszabo/vpp,milanlenco/vpp-1,rastislavszabo/vpp,brecode/vpp,brecode/vpp,rastislavszabo/vpp,brecode/vpp,milanlenco/vpp-1,milanlenco/vpp-1,brecode/vpp,rastislavszabo/vpp,milanlenco/vpp-1