[LOGMGR-104] SyslogHandler doesn't handle multi-byte characters

As I wrote in LOGMGR-104, I tried to log multi-byte message with both of org.jboss.logmanager.handlers.SyslogHandler and org.apache.log4j.net.SyslogAppender for same message, only SyslogHandler output were corrupted. see:
![syslog](https://f.cloud.github.com/assets/6468155/2365148/1162d88a-a6ac-11e3-96c8-4e04159e28c2.png)

This commit fixes this issue. most of codes were taken from:
http://info.michael-simons.eu/2013/01/21/java-mysql-and-multi-byte-utf-8-support/