[cern] mount /etc/hosts to kubelet

Signed-off-by: Spyros Trigazis <spyridon.trigazis@cern.ch>

cern-release

 KUBE_TAG="v1.11.1"
 DOCKER_TAG="17.09-1"
-RELEASE="7"
+RELEASE="8"

kubernetes-kubelet/config.json.template

@@ -304,6 +304,15 @@
                "ro"
            ]
          },
+         {
+             "type": "bind",
+             "source": "/etc/hosts",
+             "destination": "/etc/hosts",
+             "options": [
+                 "rbind",
+                 "ro"
+             ]
+         },
 	 {
 	    "type": "bind",
 	    "source": "/etc/pki",