support async replication #395

Job	Run time
Build images	5s
test (GODOG_FEATURE=active_nodes.feature make test)	2m 44s
test (GODOG_FEATURE=async.feature make test)	2m 41s
test (GODOG_FEATURE=cascade_replicas.feature make test)	2m 43s
test (GODOG_FEATURE=CLI.feature make test)	1m 34s
test (GODOG_FEATURE=crash_recovery.feature make test)	2m 40s
test (GODOG_FEATURE=events_reenable.feature make test)	2m 39s
test (GODOG_FEATURE=failover.feature make test)	2m 39s
test (GODOG_FEATURE=free_space.feature make test)	2m 35s
test (GODOG_FEATURE=host_discovery.feature make test)	2m 45s
test (GODOG_FEATURE=host_management.feature make test)	2m 41s
test (GODOG_FEATURE=maintenance.feature make test)	2m 42s
test (GODOG_FEATURE=offline_mode.feature make test)	2m 35s
test (GODOG_FEATURE=priority.feature make test)	2m 41s
test (GODOG_FEATURE=readonly_filesystem.feature make test)	2m 45s
test (GODOG_FEATURE=recovery.feature make test)	2m 43s
test (GODOG_FEATURE=repair.feature make test)	2m 39s
test (GODOG_FEATURE=statefile.feature make test)	2m 41s
test (GODOG_FEATURE=switchover_from.feature make test)	2m 51s
test (GODOG_FEATURE=switchover_to.feature make test)	2m 35s
test (GODOG_FEATURE=zk_failure.feature make test)	2m 38s
test (GODOG_FEATURE=zk_maintenance.feature make test)	2m 42s
	55m 18s

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