increase timeout to 60s when connecting to tidb database

[baurine]

close #878

but in fact, we have kinds of timeout, not sure whether it is ok to only increase this timeout.

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[breezewish]

@baurine We also have other kind of timeouts, like proxy timeout. Could you confirm this behaviour? (e.g. whether increasing the proxy timeout is necessary).

[baurine]

@baurine We also have other kind of timeouts, like proxy timeout. Could you confirm this behaviour? (e.g. whether increasing the proxy timeout is necessary).

ok, I will check it.

[breezewish]

Seems that there is no proxy timeout. I think we can go on for now and see whether it can be improved in future.

One thing to do: Now we have some connection logic in tidb-dashboard/util. Could you also add timeout settings for it, so that we will not meet regressions when switching to it?