Moves (most) everything into the default namespace
There was an apparent issue with the external-dns
deployment in which the deployment was in the default namespace but the RBAC roles was in the external-dns
namespace, causing the deployment to fail. The failure of the external-dns
deployment in turn was causing the failure of the GitHub Maintenance Exporter deployment (no DNS records were being created). Consensus seems to be that, for now, namespaces are more trouble than they are worth in the prometheus-federation cluster. This PR puts most everything in the default namespace.