When parsing cookie values, sanitize end-of-lines
    
    When parsing a cookie value returned by an external CA helper, perform
    the end-of-line sanitation (if it's one line, strip the EOL, make sure
    we use only LF characters) that happens as a side-effect when we save
    and restore the value, so that we don't behave inconsistentlhy until
    we're restarted.