I'm commencing OS upgrades for the pythontest service to the latest Ubuntu LTS - which is used for some network tests in the CPython test suite (see lines referencing pythontest.net.)

No changes should be necessary on anyones end, but if anyone happens to run their tests with internet access enabled some may fail during this upgrade.

### Tasks
- [x] Host provisioned
- [x] Data migrated
- [x] Test suite tested against current `pythontest` service
- [x] Test suite tested against new `pythontest` service
- [x] Test suite tested against bogus endpoint to ensure fails indeed... fail
- [x] Old production host shut down
- [x] New production host swapped out
- [x] Test suite tested against replaced `pythontest` service
- [x] DNS records swapped in Route53