test: update k8s versions to 1.9.10 1.10.7 1.11.2 and 1.12.0-beta.0
test: update k8s versions to 1.9.10 1.10.7 1.11.2 and 1.12.0-beta.0

Signed-off-by: André Martins <bc9800b9d52a24cce72a73dd528afed53f10e5fc@cilium.io>

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