Autogenerate database configuration and secret key if not provided

This also persists those after removal, so the database PV is still functional

deploy/awx-operator.yaml

@@ -96,6 +96,7 @@ apiVersion: apps/v1
 kind: Deployment
 metadata:
   name: awx-operator
+  namespace: default
 spec:
   replicas: 1
   selector: