Bump k8s version to v1.7.8-3

Change-Id: I017c6dd20e7a519b30a2861e16d5bad8c692adc3
diff --git a/classes/cluster/sl-k8s-contrail/kubernetes/init.yml b/classes/cluster/sl-k8s-contrail/kubernetes/init.yml
index 906ec13..6d3270f 100644
--- a/classes/cluster/sl-k8s-contrail/kubernetes/init.yml
+++ b/classes/cluster/sl-k8s-contrail/kubernetes/init.yml
@@ -19,7 +19,7 @@
     kubernetes_calicoctl_image: docker-prod-virtual.docker.mirantis.net/mirantis/projectcalico/calico/ctl:latest
     kubernetes_calico_image: docker-prod-virtual.docker.mirantis.net/mirantis/projectcalico/calico/node:latest
     kubernetes_calico_cni_image: docker-prod-virtual.docker.mirantis.net/mirantis/projectcalico/calico/cni:latest
-    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_netchecker_agent_image: quay.io/l23network/k8s-netchecker-agent:v1.0
     kubernetes_netchecker_server_image: quay.io/l23network/k8s-netchecker-server:v1.0
     kubernetes_externaldns_image: mirantis/external-dns:latest