Move OVN backup stuff to a separate directory.

This helps make it easy to use:

commonLabels:
  app: ovn-backup

to label all of the resources in kustomization.yaml, and the backup
functionality started cluttering up the main directory.

JIRA:OSPC-432

docs/infrastructure-ovn-setup.md

@@ -123,8 +123,19 @@ If there's ever a need to reconfigure a node, simply remove the label and the Da
 
 !!! note
 
-    To upload backups to a Ceph Swift API gateway, edit ovn-backup.config to set
+    To upload backups to Swift, edit /opt/genestack/kustomize/ovn/ovn-backup/ovn-backup.config to set
     `SWIFT_UPLOAD' "true"`, edit the other related options appropriately (i.e.,
-    set the SWIFT_BASE_URL and CONTAINER) and put the username and secret key of
-    the account to use in `swift-account.env` before running `kubectl apply` an
-    indicated above.
+    set the KEYSTONE_URL and CONTAINER) and fill the username, password or API,
+    domain name, project ID, and domain ID of an user to use for backup (to get
+    a scoped token suitable for uploading to Swift) in `swift-account.env` and
+    then run:
+
+    kubectl apply -k /opt/genestack/kustomize/ovn/ovn-backup \
+    --prune -l app=ovn-backup \
+    --prune-allowlist=core/v1/Secret \
+    --prune-allowlist=core/v1/ConfigMap
+
+    If you need to change variables in the future, you can edit the relevant
+    files and use `kubectl` with these prune options to avoid accumulating
+    old ConfigMaps and Secrets from successive `kubectl apply` operations, but
+    you can omit the pruning options if desired.

kustomize/ovn/kustomization.yaml

@@ -1,18 +1,2 @@
-secretGenerator:
-  - name: ovn-backup-swift-account
-    namespace: kube-system
-    envs:
-      - swift-account.env
-configMapGenerator:
-  - name: ovn-backup-script
-    namespace: kube-system
-    files:
-    - ovn-backup.sh
-    - get-swift-url.pl
-  - name: ovn-backup-config
-    namespace: kube-system
-    envs:
-    - ovn-backup.config
 resources:
   - ovn-setup.yaml
-  - ovn-backup.yaml

kustomize/ovn/ovn-backup/kustomization.yaml

@@ -0,0 +1,19 @@
+commonLabels:
+  app: ovn-backup
+secretGenerator:
+  - name: ovn-backup-swift-account
+    namespace: kube-system
+    envs:
+      - swift-account.env
+configMapGenerator:
+  - name: ovn-backup-script
+    namespace: kube-system
+    files:
+    - ovn-backup.sh
+    - get-swift-url.pl
+  - name: ovn-backup-config
+    namespace: kube-system
+    envs:
+    - ovn-backup.config
+resources:
+  - ovn-backup.yaml