Bump github.com/docker/docker #174

Job	Run time
Prepare	9s
Test (GODOG_FEATURE=00_cluster_smoke make test)	1m 32s
Test (GODOG_FEATURE=00_sentinel_smoke make test)	1m 44s
Test (GODOG_FEATURE=01_cluster_maintenance make test)	7m 27s
Test (GODOG_FEATURE=01_sentinel_maintenance make test)	7m 41s
Test (GODOG_FEATURE=02_cluster_switchover_from make test)	5m 27s
Test (GODOG_FEATURE=02_sentinel_switchover_from make test)	6m 35s
Test (GODOG_FEATURE=03_cluster_switchover_to make test)	4m 39s
Test (GODOG_FEATURE=03_sentinel_switchover_to make test)	5m 11s
Test (GODOG_FEATURE=04_cluster_failover make test)	17m 34s
Test (GODOG_FEATURE=04_sentinel_failover make test)	19m 43s
Test (GODOG_FEATURE=05_cluster_replication_fix make test)	4m 57s
Test (GODOG_FEATURE=05_sentinel_replication_fix make test)	5m 4s
Test (GODOG_FEATURE=06_cluster_lost make test)	2m 35s
Test (GODOG_FEATURE=06_sentinel_lost make test)	2m 56s
Test (GODOG_FEATURE=07_cluster_local_repair make test)	14m 10s
Test (GODOG_FEATURE=07_sentinel_local_repair make test)	14m 49s
	2h 2m 13s

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