Remove bashism from goagent-initd

"&>" is bash-specific. I use dash as /bin/sh and it doesn't work.

Portage tree里的启动脚本都避免bashism的：

/etc/init.d # fgrep '2>&1' * | wc -l
45
/etc/init.d # fgrep '&>' * | wc -l
1              [这一个就是goagent]