Upgrade freebsd 10.3 to 11

Ref:
1. https://sysadmin-note.ru/obnovlenie-freebsd-s-10-3-do-11-0/
2. https://www.linuxsecrets.com/en/entry/51-freebsd/2017/08/30/2926-upgrading-freebsd-11-0-to-11-1