Decommission gorwen in Dublin

[Firefishy]

Decommission gorwen at Dublin. Retired machine.

• [x] Remove Chef config
• [x] Wipe Disks
• [x] Remove DNS
• [ ] De-rack
• [ ] Disposed

Machine accidentally be labelled jakelong per #1148 Twin: #1122

[Firefishy]

Actual spinning rust disks!

HPE DDR3 ECC memory might be worth recovering before disposal, but very low priority.

[pnorman]

Machines with DDR3 are gorwen's age or older, so I don't see a need to save the RAM.

[Firefishy]

Wiped and ready for de-rack.