Initial commit for emacs setting files (.emacs.d).

This setting files are used under linux.
Added linux setting file.
Modified to add IPv6 interface.
Added the "ufw" file.
Modified for IPv6.
Added sysctl.conf, ufw.conf.
Modified for IPv6.
Revert ufw file manually.
Modified not to use 'bond0' interface.

When using bonding interface, IPv6 is not working correctly.