Reduce observable downtime in senticache mode #566

Job	Run time
Prepare	13s
Test (GODOG_FEATURE=00_cluster_smoke make test)	2m 1s
Test (GODOG_FEATURE=00_sentinel_smoke make test)	2m 47s
Test (GODOG_FEATURE=01_cluster_maintenance make test)	6m 48s
Test (GODOG_FEATURE=01_sentinel_maintenance make test)	7m 29s
Test (GODOG_FEATURE=02_cluster_switchover_from make test)	5m 21s
Test (GODOG_FEATURE=02_sentinel_switchover_from make test)	6m 10s
Test (GODOG_FEATURE=03_cluster_switchover_to make test)	4m 43s
Test (GODOG_FEATURE=03_sentinel_switchover_to make test)	5m 11s
Test (GODOG_FEATURE=04_cluster_failover make test)	16m 52s
Test (GODOG_FEATURE=04_sentinel_failover make test)	19m 17s
Test (GODOG_FEATURE=05_cluster_replication_fix make test)	6m 33s
Test (GODOG_FEATURE=05_sentinel_replication_fix make test)	5m 1s
Test (GODOG_FEATURE=06_cluster_lost make test)	5m 24s
Test (GODOG_FEATURE=06_sentinel_lost make test)	5m 38s
Test (GODOG_FEATURE=07_cluster_local_repair make test)	13m 56s
Test (GODOG_FEATURE=07_sentinel_local_repair make test)	14m 21s
	2h 7m 45s

Provide feedback