[COMMON] add pre upgrade script for mariadb-galera

When upgrading from a version to another, it may be impossible to do it
"simply" because of changes in immutable properties of statefulsets. We
change that here by creating a temporary deployment which will hold the
whole databases during the time the old statefulset gets destroyed and
the new one gets created.

Issue-ID: OOM-2316
Signed-off-by: tringuyen <tri.nguyen@tatacommunications.com>
Signed-off-by: Sylvain Desbureaux <sylvain.desbureaux@orange.com>
Change-Id: I318d72830d5002f50597e23e0753e292f8b47c53
diff --git a/kubernetes/common/mariadb-galera/values.yaml b/kubernetes/common/mariadb-galera/values.yaml
index af08ea3..4ccb0e5 100644
--- a/kubernetes/common/mariadb-galera/values.yaml
+++ b/kubernetes/common/mariadb-galera/values.yaml
@@ -42,7 +42,10 @@
 
   readinessRepository: oomk8s
   readinessImage: readiness-check:2.0.2
-
+  busyboxImage: busybox:1.30
+  busyboxRepository: docker.io
+  # kubeclt image
+  kubectlImage: "bitnami/kubectl:1.15"
 
 #################################################################
 # Application configuration defaults.