Comment 7 for bug 1459033

After manually removing the entry as described on #5, I can add new machines in the environment:

  "23":
    agent-state: pending
    dns-name: hbpkx.maas
    instance-id: /MAAS/api/1.0/nodes/node-e8a0b09c-03e9-11e5-bff9-b827eb833655/
    series: trusty
    hardware: arch=amd64 cpu-cores=4 mem=4096M tags=use-fastpath-installer