Make sessinAffinity stickable to clientIP

This would help, but not fix #5120. It's now supports the running of multiple pods for scaling, without the issue that the session will not known on the backend pod.

openshift/wekan.yml

@@ -62,7 +62,7 @@ objects:
       targetPort: 8080
     selector:
       name: "${WEKAN_SERVICE_NAME}"
-    sessionAffinity: None
+    sessionAffinity: ClientIP
     type: ClusterIP
 - apiVersion: v1
   kind: Service