External replication refactoring (#39) #26

Job	Run time
Build images	7s
test (GODOG_FEATURE=active_nodes.feature make test)	8m 3s
test (GODOG_FEATURE=async.feature make test)	4m 18s
test (GODOG_FEATURE=cascade_replicas.feature make test)	7m 45s
test (GODOG_FEATURE=CLI.feature make test)	4m 30s
test (GODOG_FEATURE=crash_recovery.feature make test)	5m 30s
test (GODOG_FEATURE=events_reenable.feature make test)	3m 0s
test (GODOG_FEATURE=failover.feature make test)	14m 24s
test (GODOG_FEATURE=free_space.feature make test)	6m 14s
test (GODOG_FEATURE=host_discovery.feature make test)	3m 51s
test (GODOG_FEATURE=host_management.feature make test)	3m 43s
test (GODOG_FEATURE=maintenance.feature make test)	6m 24s
test (GODOG_FEATURE=offline_mode.feature make test)	2m 38s
test (GODOG_FEATURE=priority.feature make test)	5m 52s
test (GODOG_FEATURE=readonly_filesystem.feature make test)	2m 39s
test (GODOG_FEATURE=recovery.feature make test)	3m 17s
test (GODOG_FEATURE=repair.feature make test)	10m 25s
test (GODOG_FEATURE=statefile.feature make test)	4m 31s
test (GODOG_FEATURE=switchover_from.feature make test)	11m 9s
test (GODOG_FEATURE=switchover_to.feature make test)	10m 46s
test (GODOG_FEATURE=zk_failure.feature make test)	8m 25s
test (GODOG_FEATURE=zk_maintenance.feature make test)	4m 25s
	2h 11m 56s

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