SyslogLayout contains extra space

There is a extra space in the SyslogLayout so that that message is not compliant with the BSD format:

    /**
     * Date format used if header = true.
     */
    private final SimpleDateFormat dateFormat = new SimpleDateFormat("MMM dd HH:mm:ss ", Locale.ENGLISH);

Note the extra space at the end of the date format.

When this is used, another space is appended afterwards all the same:

        addDate(event.getTimeMillis(), buf);
        buf.append(' ');

This leads to incorrect data containing two spaces between the date field and the localHostname.