More secure permissions for /root and /etc/sysctl.conf

[Gordon Bergling]

Hi,

I recently stumbled upon the default world readable permissons of /root and 
/etc/sysctl.conf. I think that it would be more secure to reduce the default
permission for /root to 0700 and to 0600 for /etc/sysctl.conf.

I prepared a differtial for the proposed change:
https://reviews.freebsd.org/D23392

What do you think?

Best regards,

Gordon