[memcached] Fix statefulset spec format

Recently we switched from Deployment to Statefulset
to make it possible to work with memcached instances
directly w/o load balancer. The strategy field is not
valid for statefulsets, so here we remove it.

Change-Id: I52db7dd4563639a55c12850147cf256cec8b1ee4

memcached/Chart.yaml

@@ -15,6 +15,6 @@ apiVersion: v1
 appVersion: v1.5.5
 description: OpenStack-Helm Memcached
 name: memcached
-version: 0.1.16
+version: 0.1.17
 home: https://github.com/memcached/memcached
 ...

memcached/templates/statefulset.yaml

@@ -52,7 +52,6 @@ spec:
   selector:
     matchLabels:
 {{ tuple $envAll "memcached" "server" | include "helm-toolkit.snippets.kubernetes_metadata_labels" | indent 6 }}
-{{ tuple $envAll | include "helm-toolkit.snippets.kubernetes_upgrades_deployment" | indent 2 }}
   template:
     metadata:
       annotations:

releasenotes/notes/memcached.yaml

@@ -17,4 +17,5 @@ memcached:
   - 0.1.14 Use quay.io/airshipit/kubernetes-entrypoint:latest-ubuntu_focal by default
   - 0.1.15 Allow to pass additional service parameters
   - 0.1.16 Change deployment type to statefulset
+  - 0.1.17 Fix statefulset spec format
 ...