When server enable tls, go-redis tls config is not correct. it will return i/o timeout error message

[Patrick0308]

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Expected Behavior

When server enable tls and go-redis tls config is not correct,

error message should be TLS handshake timeout.

Current Behavior

Error message is i/o timeout.

Possible Solution

See golang http transport:
https://github.com/golang/go/blob/master/src/net/http/transport.go#L1563