tests: disable k8s 1.12-alpha.0 tests
tests: disable k8s 1.12-alpha.0 tests

Since k8s 1.12-alpha.0 was build before the integration of the CRD
Update Status feature, the tests will always fail as Cilium uses this
feature for all k8s versions >= 1.11.0.

This commit should be reverted once k8s 1.12-beta.0 is released.

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

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