Fix switchover when many connections appear #582

Job	Run time
Build images	9s
test (GODOG_FEATURE=active_nodes.feature make test)	7m 1s
test (GODOG_FEATURE=async.feature make test)	3m 28s
test (GODOG_FEATURE=cascade_replicas.feature make test)	6m 45s
test (GODOG_FEATURE=CLI.feature make test)	4m 10s
test (GODOG_FEATURE=crash_recovery.feature make test)	4m 39s
test (GODOG_FEATURE=events_reenable.feature make test)	2m 9s
test (GODOG_FEATURE=failover.feature make test)	12m 26s
test (GODOG_FEATURE=free_space.feature make test)	5m 50s
test (GODOG_FEATURE=host_discovery.feature make test)	2m 59s
test (GODOG_FEATURE=host_management.feature make test)	2m 56s
test (GODOG_FEATURE=maintenance.feature make test)	4m 32s
test (GODOG_FEATURE=offline_mode.feature make test)	2m 7s
test (GODOG_FEATURE=priority.feature make test)	5m 28s
test (GODOG_FEATURE=readonly_filesystem.feature make test)	2m 11s
test (GODOG_FEATURE=recovery.feature make test)	3m 5s
test (GODOG_FEATURE=repair.feature make test)	9m 52s
test (GODOG_FEATURE=repl_mon.feature make test)	3m 37s
test (GODOG_FEATURE=statefile.feature make test)	3m 48s
test (GODOG_FEATURE=switchover_from.feature make test)	11m 10s
test (GODOG_FEATURE=switchover_to.feature make test)	11m 59s
test (GODOG_FEATURE=zk_failure.feature make test)	7m 10s
test (GODOG_FEATURE=zk_maintenance.feature make test)	4m 2s
	2h 1m 33s

Provide feedback