Next sentinel host is not contacted after socket timeout

[svend]

If a there is a socket timeout with a sentinel host, redis.exceptions.TimeoutError is returned and none of the other sentinel hosts are contacted.

If there is a connection timeout or connection refused, the next host is tried. It would great if there was way to try the next sentinel host in the same way for socket timeout errors.

(You can retry_on_timeout=True to retry the same sentinel host once, but if you get a socket timeout a second time, redis.exceptions.TimeoutError is returned.)