fix: enabling semisync; feat: errno in logs #468

Job	Run time
Build images	1m 51s
test (GODOG_FEATURE=active_nodes.feature make test)	6m 52s
test (GODOG_FEATURE=async.feature make test)	3m 33s
test (GODOG_FEATURE=cascade_replicas.feature make test)	6m 43s
test (GODOG_FEATURE=CLI.feature make test)	3m 47s
test (GODOG_FEATURE=crash_recovery.feature make test)	4m 42s
test (GODOG_FEATURE=events_reenable.feature make test)	1m 50s
test (GODOG_FEATURE=failover.feature make test)	12m 13s
test (GODOG_FEATURE=free_space.feature make test)	5m 27s
test (GODOG_FEATURE=host_discovery.feature make test)	2m 55s
test (GODOG_FEATURE=host_management.feature make test)	3m 5s
test (GODOG_FEATURE=maintenance.feature make test)	4m 18s
test (GODOG_FEATURE=offline_mode.feature make test)	2m 13s
test (GODOG_FEATURE=priority.feature make test)	5m 20s
test (GODOG_FEATURE=readonly_filesystem.feature make test)	1m 56s
test (GODOG_FEATURE=recovery.feature make test)	2m 57s
test (GODOG_FEATURE=repair.feature make test)	9m 28s
test (GODOG_FEATURE=statefile.feature make test)	4m 19s
test (GODOG_FEATURE=switchover_from.feature make test)	9m 28s
test (GODOG_FEATURE=switchover_to.feature make test)	10m 48s
test (GODOG_FEATURE=zk_failure.feature make test)	7m 14s
test (GODOG_FEATURE=zk_maintenance.feature make test)	4m 12s
	1h 55m 11s

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