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/hswaw/site/prod.jsonnet b/hswaw/site/prod.jsonnet
index 1dc2173..a84950e 100644
--- a/hswaw/site/prod.jsonnet
+++ b/hswaw/site/prod.jsonnet
@@ -13,9 +13,9 @@
         image: 'registry.k0.hswaw.net/q3k/hswaw-site@sha256:02414c9e7e0751abe7a8ad3ef1b1ccc35f1f89edf67a6f0b396b7a1d0c178f2b',
     },
 
-    ns: kube.Namespace(cfg.namespace),
+    local ns = kube.Namespace(cfg.namespace),
 
-    deployment: top.ns.Contain(kube.Deployment(cfg.name)) {
+    deployment: ns.Contain(kube.Deployment(cfg.name)) {
         spec+: {
             replicas: 3,
             template+: {
@@ -41,11 +41,11 @@
         },
     },
 
-    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.domains,
         target_service:: top.service,
     },