Bump k8s version to v1.7.8-3

Change-Id: I017c6dd20e7a519b30a2861e16d5bad8c692adc3
diff --git a/classes/cluster/k8s-ha-calico/kubernetes/init.yml b/classes/cluster/k8s-ha-calico/kubernetes/init.yml
index 7eecf89..25a2b52 100644
--- a/classes/cluster/k8s-ha-calico/kubernetes/init.yml
+++ b/classes/cluster/k8s-ha-calico/kubernetes/init.yml
@@ -23,7 +23,7 @@
     kubernetes_calico_cni_image: docker-prod-virtual.docker.mirantis.net/mirantis/projectcalico/calico/cni:latest
     kubernetes_calico_policy_image: calico/kube-policy-controller:v0.5.4
 
-    kubernetes_hyperkube_image: docker-prod-virtual.docker.mirantis.net/mirantis/kubernetes/hyperkube-amd64:v1.7.5-2
+    kubernetes_hyperkube_image: docker-prod-virtual.docker.mirantis.net/mirantis/kubernetes/hyperkube-amd64:v1.7.8-3
     kubernetes_virtlet_image: mirantis/virtlet:latest
     kubernetes_netchecker_agent_image: mirantis/k8s-netchecker-agent:stable
     kubernetes_netchecker_server_image: mirantis/k8s-netchecker-server:stable