Enhancements to make stats cachedump configurable

Memcached stats cachedump is enabled by default. Changes in this
pathset provide an option to configure stats cachedump as desired
during deployment i.e. the stats cachedump can be disabled to
prevent user obtaining sensitive info via the cachedump data.

Change-Id: Ic6254f89b1478a414ac275436ddd659b16b75f98

memcached/Chart.yaml

@@ -15,6 +15,6 @@ apiVersion: v1
 appVersion: v1.5.5
 description: OpenStack-Helm Memcached
 name: memcached
-version: 0.1.1
+version: 0.1.2
 home: https://github.com/memcached/memcached
 ...

memcached/templates/bin/_memcached.sh.tpl

@@ -20,5 +20,8 @@ memcached --version
 exec memcached -v \
   -p ${MEMCACHED_PORT} \
   -U 0 \
+{{- if not .Values.conf.memcached.stats_cachedump.enabled }}
+  -X \
+{{- end }}
   -c ${MEMCACHED_MAX_CONNECTIONS} \
   -m ${MEMCACHED_MEMORY}

memcached/values.yaml

@@ -22,6 +22,8 @@ conf:
     # NOTE(pordirect): this should match the value in
     # `pod.resources.memcached.memory`
     memory: 1024
+    stats_cachedump:
+      enabled: true
 
 dependencies:
   dynamic:

releasenotes/notes/memcached.yaml

@@ -2,4 +2,5 @@
 memcached:
   - 0.1.0 Initial Chart
   - 0.1.1 Change helm-toolkit dependency version to ">= 0.1.0"
+  - 0.1.2 Make stats cachedump configurable.
 ...