Ginkgo: Add Kubernetes 1.9 support
Ginkgo: Add Kubernetes 1.9 support

Added kubernetes 1.9 support in vagrantfile and added that version in
Nightly test

Signed-off-by: Eloy Coto <2a8acc28452926ceac4d9db555411743254cf5f9@gmail.com>

tgraf/cilium,cilium/cilium,tgraf/cilium,scanf/cilium,michi-covalent/cilium,cilium/cilium,eloycoto/cilium,eloycoto/cilium,cilium/cilium,cilium/cilium,eloycoto/cilium,tgraf/cilium,scanf/cilium,scanf/cilium,eloycoto/cilium,tklauser/cilium,tklauser/cilium,tgraf/cilium,eloycoto/cilium,michi-covalent/cilium,cilium/cilium,cilium-team/cilium,scanf/cilium,tklauser/cilium,michi-covalent/cilium,michi-covalent/cilium,tklauser/cilium,eloycoto/cilium,scanf/cilium,tgraf/cilium,scanf/cilium,scanf/cilium,eloycoto/cilium,cilium-team/cilium,tgraf/cilium,michi-covalent/cilium,tklauser/cilium