Client connection / maybe_refresh_metadata changes #2507
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Renames
_maybe_connect->_init_connectand only attempts to progress connection state if connection is currently disconnected. This moves all secondary connection work into the selector / poll loop. Maybe refresh metadata now runs after the connecting loop, calls_init_connectdirectly, and returns a retry timeout if connection fails immediately. This should help fix a race condition where a quick failing connection caused us to block indefinitely in the poll selector.