switchover improvement (#28) #229

Job	Run time
Build images	8s
test (GODOG_FEATURE=active_nodes.feature make test)	7m 36s
test (GODOG_FEATURE=async.feature make test)	4m 4s
test (GODOG_FEATURE=cascade_replicas.feature make test)	7m 39s
test (GODOG_FEATURE=CLI.feature make test)	4m 6s
test (GODOG_FEATURE=crash_recovery.feature make test)	6m 7s
test (GODOG_FEATURE=events_reenable.feature make test)	2m 9s
test (GODOG_FEATURE=failover.feature make test)	12m 57s
test (GODOG_FEATURE=free_space.feature make test)	7m 1s
test (GODOG_FEATURE=host_discovery.feature make test)	3m 36s
test (GODOG_FEATURE=host_management.feature make test)	3m 42s
test (GODOG_FEATURE=maintenance.feature make test)	5m 5s
test (GODOG_FEATURE=offline_mode.feature make test)	2m 21s
test (GODOG_FEATURE=priority.feature make test)	5m 53s
test (GODOG_FEATURE=readonly_filesystem.feature make test)	2m 56s
test (GODOG_FEATURE=recovery.feature make test)	3m 29s
test (GODOG_FEATURE=repair.feature make test)	11m 2s
test (GODOG_FEATURE=statefile.feature make test)	4m 25s
test (GODOG_FEATURE=switchover_from.feature make test)	11m 9s
test (GODOG_FEATURE=switchover_to.feature make test)	11m 38s
test (GODOG_FEATURE=zk_failure.feature make test)	7m 49s
test (GODOG_FEATURE=zk_maintenance.feature make test)	4m 50s
	2h 9m 42s

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