[lftp] ftp: wait for QUIT reply before closing control socket

Is there a way to disable this? I just went from 4.2.2 to 4.6.5 and at least one FTP server I integrate with doesn't always reply to QUIT commands. I'm not sure of the implications of `set ftp:use-quit false` so I'd rather still send the QUIT command but close the connection after and not wait for

[lftp] misbehaving HTTP server makes lftp retry forever

I'm downloading from an HTTP server where it stops sending the file at about 40 MB and then stops sending data. lftp doesn't seem to handle this very well and retries the transfer over and over and over, indefinitely. https://gist.github.com/nate/e7e47d3a86118439c36a1877847d8b01 This happens with