GANDI: Enable cmode concurrent #1176

Job	Run time
build	1m 4s
integration-test-providers	5s
integration-tests (DIGITALOCEAN)	4m 23s
integration-tests (AZURE_DNS)	7m 31s
integration-tests (BIND)	1m 33s
integration-tests (CLOUDFLAREAPI)	8m 47s
integration-tests (GANDI_V5)	6m 9s
integration-tests (GCLOUD)	4m 44s
integration-tests (HEDNS)	10m 16s
integration-tests (HEXONET)	4m 16s
integration-tests (NAMEDOTCOM)	4m 47s
integration-tests (NS1)	4m 23s
integration-tests (SAKURACLOUD)	4m 4s
integration-tests (ROUTE53)	3m 33s
integration-tests (TRANSIP)	11m 12s
	1h 16m 47s

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