remove a namespace stuck on terminating

force_delete_namespace.sh

# In the Master's shell execute:
curl -k -H "Content-Type: application/json" -XPUT --cacert /srv/kubernetes/ca.crt -H "Authorization: Bearer <token>" --data-binary @ns.json https://localhost/api/v1/namespaces/namespace-name/finalize

# The bearer token can be found in the file below, under 'admin':
sudo cat /srv/kubernetes/known_tokens.csv

# Content for ns.json:
{
  "kind": "Namespace",
  "apiVersion": "v1",
  "metadata": {
    "name": "namespace-name",
    "selfLink": "/api/v1/namespaces/namespace-name",
    "annotations": {
      "kubectl.kubernetes.io/last-applied-configuration": "{\"apiVersion\":\"v1\",\"kind\":\"Namespace\",\"metadata\":{\"annotations\":{},\"name\":\"namespace-name\"},\"spec\":{\"finalizers\":[\"foregroundDeletion\"]}}\n"
    }
  },
  "spec": {
    "finalizers": [
    ]
  },
  "status": {
    "phase": "Terminating"
  }
}