The Go, Python, Ruby and Java SDKs try a hostname's next address when a connection attempt fails or stalls

Previously each SDK connected to the first address DNS returned for the API and returned an error if that address did not answer. Now, when a connection attempt fails, or has not completed after 250 ms, the SDK starts an attempt to the hostname's next address and uses whichever connects first. This applies to API requests, WebSocket connections and proxied connections. Behavior is unchanged when the hostname resolves to a single address. Available in the next patch release of each of these SDKs; no code change is required.