kube: standardize on a `local ns` convention

A convention is introduced to specify the kube.Namespace object in a deployment as a `local ns` instead of an `ns:` or a `namespace:` for these reasons:

- non-cluster admins cannot create new namespaces, and we've been moving in the direction of specifying objects that require cluster admin permissions to apply (policies, role bindings) in //cluster/kube/k0 instead of in the app jsonnet
- namespace admins CAN delete the namespace, making `kubecfg delete` unexpectedly dangerous (especially if a namespace contains more than just the contents of the file being applied - common with personal namespaces)
- `.Contain()` is a common operation, and it shows up in lines that are pretty long, so `ns.Contain()` is preferable to `app.ns.Contain()` or `service.namespace.Contain()`

Change-Id: Ie4ea825376dbf6faa175179054f3ee3de2253ae0
Reviewed-on: https://gerrit.hackerspace.pl/c/hscloud/+/1804
Reviewed-by: q3k <q3k@hackerspace.pl>
diff --git a/personal/radex/demo/prod.jsonnet b/personal/radex/demo/prod.jsonnet
index df8dd28..fbc4d03 100644
--- a/personal/radex/demo/prod.jsonnet
+++ b/personal/radex/demo/prod.jsonnet
@@ -10,9 +10,9 @@
         domain: "demo.hs.radex.io",
     },
 
-    ns: kube.Namespace("personal-radex"),
+    local ns = kube.Namespace("personal-radex"),
 
-    deployment: top.ns.Contain(kube.Deployment(cfg.name)) {
+    deployment: ns.Contain(kube.Deployment(cfg.name)) {
         spec+: {
             replicas: 3,
             template+: {
@@ -34,11 +34,11 @@
         },
     },
 
-    service: top.ns.Contain(kube.Service(cfg.name)) {
+    service: ns.Contain(kube.Service(cfg.name)) {
         target:: top.deployment,
     },
 
-    ingress: top.ns.Contain(kube.SimpleIngress(cfg.name)) {
+    ingress: ns.Contain(kube.SimpleIngress(cfg.name)) {
         hosts:: [cfg.domain],
         target_service:: top.service,
     },