Update FreeBSD hostname

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1. Show current hostname

hostname
2. Edit `/etc/rc.conf`

vim /etc/rc.conf
And modify the hostname

hostname="new-freebsd-hostname"
3. Edit `/etc/hosts`

vim /etc/hosts
and add new hostname mapping

::1 new-freebsd-hostname
127.0.0.1 new-freebsd-hostname
-EOF-