support async replication #488

Job	Run time
Build images	5s
test (GODOG_FEATURE=active_nodes.feature make test)	7m 0s
test (GODOG_FEATURE=async.feature make test)	3m 41s
test (GODOG_FEATURE=cascade_replicas.feature make test)	7m 36s
test (GODOG_FEATURE=CLI.feature make test)	3m 49s
test (GODOG_FEATURE=crash_recovery.feature make test)	4m 25s
test (GODOG_FEATURE=events_reenable.feature make test)	2m 18s
test (GODOG_FEATURE=failover.feature make test)	12m 17s
test (GODOG_FEATURE=free_space.feature make test)	5m 42s
test (GODOG_FEATURE=host_discovery.feature make test)	3m 13s
test (GODOG_FEATURE=host_management.feature make test)	3m 5s
test (GODOG_FEATURE=maintenance.feature make test)	4m 34s
test (GODOG_FEATURE=offline_mode.feature make test)	2m 10s
test (GODOG_FEATURE=priority.feature make test)	5m 17s
test (GODOG_FEATURE=readonly_filesystem.feature make test)	2m 15s
test (GODOG_FEATURE=recovery.feature make test)	2m 54s
test (GODOG_FEATURE=repair.feature make test)	9m 15s
test (GODOG_FEATURE=repl_mon.feature make test)	3m 18s
test (GODOG_FEATURE=statefile.feature make test)	3m 53s
test (GODOG_FEATURE=switchover_from.feature make test)	10m 0s
test (GODOG_FEATURE=switchover_to.feature make test)	10m 46s
test (GODOG_FEATURE=zk_failure.feature make test)	7m 12s
test (GODOG_FEATURE=zk_maintenance.feature make test)	4m 7s
	1h 58m 52s

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