New staging2 deployment @ SafeSpring + cleanups

common/deployments/hub-staging.yaml

staging1/deployments/hub.yaml

staging1/deployments/hub.yaml

staging2/deployments/hub.yaml

staging2/inventory/1-safespring.yaml

staging2/inventory/99-all.yaml

staging2/playbooks/cvmfs.yaml

staging2/playbooks/files/calico.yaml

staging2/playbooks/files/etc

staging2/playbooks/files/jupyterhub-jwt.yaml

staging2/playbooks/files/usr

staging2/playbooks/k8s.yaml

staging2/playbooks/notebooks.yaml

staging2/playbooks/public_keys

staging2/playbooks/squid.yaml

staging2/playbooks/templates/etc/exports

staging2/playbooks/templates/etc/mailutils.conf

staging2/playbooks/templates/etc/squid

staging2/playbooks/upgrade.yaml

staging2/terraform/terraform.tfvars