external-replication: stop&start fixes #268

Job	Run time
Build images	12s
test (GODOG_FEATURE=active_nodes.feature make test)	7m 37s
test (GODOG_FEATURE=async.feature make test)	4m 43s
test (GODOG_FEATURE=cascade_replicas.feature make test)	8m 20s
test (GODOG_FEATURE=CLI.feature make test)	4m 8s
test (GODOG_FEATURE=crash_recovery.feature make test)	5m 9s
test (GODOG_FEATURE=events_reenable.feature make test)	2m 39s
test (GODOG_FEATURE=failover.feature make test)	14m 59s
test (GODOG_FEATURE=free_space.feature make test)	6m 19s
test (GODOG_FEATURE=host_discovery.feature make test)	3m 32s
test (GODOG_FEATURE=host_management.feature make test)	3m 34s
test (GODOG_FEATURE=maintenance.feature make test)	5m 10s
test (GODOG_FEATURE=offline_mode.feature make test)	2m 28s
test (GODOG_FEATURE=priority.feature make test)	6m 33s
test (GODOG_FEATURE=readonly_filesystem.feature make test)	2m 48s
test (GODOG_FEATURE=recovery.feature make test)	3m 34s
test (GODOG_FEATURE=repair.feature make test)	10m 20s
test (GODOG_FEATURE=statefile.feature make test)	4m 12s
test (GODOG_FEATURE=switchover_from.feature make test)	11m 3s
test (GODOG_FEATURE=switchover_to.feature make test)	13m 0s
test (GODOG_FEATURE=zk_failure.feature make test)	7m 38s
test (GODOG_FEATURE=zk_maintenance.feature make test)	4m 26s
	2h 12m 24s

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