FIX: data race warning in sentinel client since the newConnPool would spawn the new goroutine and use the onFailover at the same time.
FIX: data race warning in sentinel client since the newConnPool would spawn the new
goroutine and use the onFailover at the same time.

HatsuneMiku3939/redis,HatsuneMiku3939/redis,vmihailenco/redis,HatsuneMiku3939/redis,HatsuneMiku3939/redis,go-redis/redis,go-redis/redis