Add an sshd user so ssh priv seperation can work

www-data:x:33:33:www-data:/var/www:/bin/sh

backup:x:34:34:backup:/var/backups:/bin/sh

operator:x:37:37:Operator:/var:/bin/sh

nobody:x:65534:65534:nobody:/home:/bin/sh

sshd:x:103:99:Operator:/var:/bin/sh

nobody:x:99:99:nobody:/home:/bin/sh

default:x:1000:1000:Default non-root user:/home/default:/bin/sh