Add -e to pre_stop hooks

This adds -e to the pre_stop scripts, so that they fail out if
any of their commands fail.  This is required, since it's the only
way to communicate whether there is an issue during pre_hook
execution.

"The logs for a Hook handler are not exposed in Pod events.
If a handler fails for some reason, it broadcasts an event."
https://kubernetes.io/docs/concepts/containers/container-lifecycle-hooks/#container-hooks

As an example, this issue was discovered when "touch /tmp/stop"
was failing silently due to a readOnlyRootFilesystem setting,
resulting in pods that would not successfully Terminate until
the grace period was exhausted.

Change-Id: Ic9a228230d944530e31ed61f4239fd434cbb6187

charts/apiserver/templates/bin/_pre_stop.tpl

@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-set -x
+set -ex
 
 touch /tmp/stop
 sleep {{ .Values.anchor.period }}

charts/controller_manager/templates/bin/_pre_stop.tpl

@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-set -x
+set -ex
 
 touch /tmp/stop
 sleep {{ .Values.anchor.period }}

charts/etcd/templates/bin/_pre_stop.tpl

@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-set -x
+set -ex
 
 function cleanup_host {
     rm -f $MANIFEST_PATH

charts/haproxy/templates/bin/_pre_stop.tpl

@@ -15,7 +15,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */}}
 
-set -x
+set -ex
 
 touch /tmp/stop
 sleep {{ .Values.conf.anchor.period }}

charts/scheduler/templates/bin/_pre_stop.tpl

@@ -15,7 +15,7 @@
 # limitations under the License.
 */}}
 
-set -x
+set -ex
 
 touch /tmp/stop
 sleep {{ .Values.anchor.period }}