Add server connect timeout to HTTPClient #2606
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The existing setTimeout() function is effective only once the client is already connected to the server. Therefore, if there is a problem establishing a connection to the server in the first place (eg. it is offline), connect() will block for up to ~20 seconds regardless of the value passed to setTimeout.
See #1433
This PR introduces a separate, self-explanatory function - setConnectTimeout(int32_t connectTimeout) - to HTTPClient, which simply takes advantage of the WiFiClient connect timeout functionality recently introduced here: #2383