Add configurable option for kube_apiserver_insecure_bind_address

roles/kubernetes/master/templates/kube-apiserver.j2

@@ -20,6 +20,9 @@ KUBE_ALLOW_PRIV="--allow_privileged=true"
 # The port on the local server to listen on.
 KUBE_API_PORT="--insecure-port={{kube_apiserver_insecure_port}} --secure-port={{ kube_apiserver_port }}"
 
+# Insecure API address (default is localhost)
+KUBE_API_INSECURE_BIND="--insecure-bind-address={{ kube_apiserver_insecure_bind_address | default('127.0.0.1') }}"
+
 # Address range to use for services
 KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range={{ kube_service_addresses }}"
 
@@ -46,7 +49,7 @@ KUBELET_CLOUDPROVIDER=""
 {% endif %}
 
 {% if ansible_service_mgr in ["sysvinit","upstart"] %}
-DAEMON_ARGS="$KUBE_LOGGING $KUBE_LOG_LEVEL $KUBE_ALLOW_PRIV $KUBE_API_PORT $KUBE_SERVICE_ADDRESSES \
-$KUBE_ETCD_SERVERS $KUBE_ADMISSION_CONTROL $KUBE_RUNTIME_CONFIG $KUBE_TLS_CONFIG $KUBE_API_ARGS \
-$KUBELET_CLOUDPROVIDER"
+DAEMON_ARGS="$KUBE_LOGGING $KUBE_LOG_LEVEL $KUBE_ALLOW_PRIV $KUBE_API_PORT $KUBE_API_INSECURE_BIND \
+$KUBE_SERVICE_ADDRESSES $KUBE_ETCD_SERVERS $KUBE_ADMISSION_CONTROL $KUBE_RUNTIME_CONFIG \
+$KUBE_TLS_CONFIG $KUBE_API_ARGS $KUBELET_CLOUDPROVIDER"
 {% endif %}