Replace systemd with sysvinit (替换systemd为sysvinit)

It’s been a year after last rebuild of my LS-WXL. I’ve saw a lot of OOM termination of transmission, LS-WXL is sooo~~ limit in memory. Checking the memery usage, it’s “systemd-journald” is competing with transmission. I’ve tried limit the memory usage of systemd-journald, and then stop logging, none have worked. Since all those trouble are caused by systemd related stuff, my last option is to replace systemd with sysvinit. Luckily, there’s a group of smart guys have the same thoughts. Following the guide below, I’ve successfully remove systemd and systemd-journald of course.