REFACTOR: prettysort should unify FQDN to "@" earlier #124

Job	Run time
integration-test-providers	3s
integration-tests (AZURE_DNS)	8m 42s
integration-tests (AXFRDDNS)	2m 10s
integration-tests (AXFRDDNS_DNSSEC)	2m 4s
integration-tests (BIND)	2m 7s
integration-tests (CLOUDFLAREAPI)	9m 42s
integration-tests (CNR)	9m 58s
integration-tests (DIGITALOCEAN)	5m 9s
integration-tests (GANDI_V5)	6m 32s
integration-tests (GCLOUD)	9m 54s
integration-tests (HEDNS)	22m 34s
integration-tests (HEXONET)	4m 13s
integration-tests (MYTHICBEASTS)	12m 15s
integration-tests (NAMEDOTCOM)	5m 43s
integration-tests (NS1)	3m 49s
integration-tests (ROUTE53)	4m 36s
integration-tests (SAKURACLOUD)	4m 31s
integration-tests (TRANSIP)	15m 22s
	2h 9m 24s

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