moving vault related things to vault namespace

lab/cluster/hello.tf

@@ -1,6 +1,7 @@
 resource kubernetes_pod nginx_plain {
   metadata {
     name = "plain-service"
+    namespace = kubernetes_namespace.vault.metadata.0.name
     labels = {
       app = "plain-app"
     }
@@ -23,6 +24,7 @@ resource kubernetes_pod nginx_plain {
 resource kubernetes_service nginx_plain {
   metadata {
     name = "plain-service"
+    namespace = kubernetes_namespace.vault.metadata.0.name
   }
   spec {
     selector = {