External replication refactoring #267

Job	Run time
Build images	6s
test (GODOG_FEATURE=active_nodes.feature make test)	8m 47s
test (GODOG_FEATURE=async.feature make test)	3m 59s
test (GODOG_FEATURE=cascade_replicas.feature make test)	7m 34s
test (GODOG_FEATURE=CLI.feature make test)	5m 1s
test (GODOG_FEATURE=crash_recovery.feature make test)	5m 24s
test (GODOG_FEATURE=events_reenable.feature make test)	2m 41s
test (GODOG_FEATURE=failover.feature make test)	12m 30s
test (GODOG_FEATURE=free_space.feature make test)	6m 24s
test (GODOG_FEATURE=host_discovery.feature make test)	4m 12s
test (GODOG_FEATURE=host_management.feature make test)	3m 35s
test (GODOG_FEATURE=maintenance.feature make test)	5m 51s
test (GODOG_FEATURE=offline_mode.feature make test)	2m 31s
test (GODOG_FEATURE=priority.feature make test)	5m 56s
test (GODOG_FEATURE=readonly_filesystem.feature make test)	2m 16s
test (GODOG_FEATURE=recovery.feature make test)	3m 43s
test (GODOG_FEATURE=repair.feature make test)	9m 56s
test (GODOG_FEATURE=statefile.feature make test)	4m 28s
test (GODOG_FEATURE=switchover_from.feature make test)	10m 30s
test (GODOG_FEATURE=switchover_to.feature make test)	11m 16s
test (GODOG_FEATURE=zk_failure.feature make test)	7m 58s
test (GODOG_FEATURE=zk_maintenance.feature make test)	4m 39s
	2h 9m 17s

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