test/k8sT: do not access redis-master via hostname, only service IP
test/k8sT: do not access redis-master via hostname, only service IP

In K8s 1.7 tests, there are issues accessing redis-master via hostname. Disable
accessing redis-master via its hostname until K8s 1.7 is updated in CI to a
newer version. See GH-3462 for more information.

Signed-off by: Ian Vernon <ian@cilium.io>

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