Bump kube dependency to 1.11.2

Bump our kube dependencies to the latest patch
level for kube 1.11.

Signed-off-by: Marcus Martins <marcus@docker.com>

Author: marcusmartins

vendor.conf

@@ -92,9 +92,9 @@ google.golang.org/grpc v1.12.0
 gopkg.in/inf.v0 d2d2541c53f18d2a059457998ce2876cc8e67cbf # v0.9.1
 gopkg.in/yaml.v2 5420a8b6744d3b0345ab293f6fcba19c978f1183 # v2.2.1
 gotest.tools v2.1.0
-k8s.io/api kubernetes-1.11.0
-k8s.io/apimachinery kubernetes-1.11.0
-k8s.io/client-go kubernetes-1.11.0
+k8s.io/api kubernetes-1.11.2
+k8s.io/apimachinery kubernetes-1.11.2
+k8s.io/client-go kubernetes-1.11.2
 k8s.io/kube-openapi d8ea2fe547a448256204cfc68dfee7b26c720acb
-k8s.io/kubernetes v1.11.0
+k8s.io/kubernetes v1.11.2
 vbom.ml/util 256737ac55c46798123f754ab7d2c784e2c71783