Bug #159: add conf mode templates for dummy interfaces.
Bug #159: add delete action for dummy interfaces.
0.20.43+vyos1+helium2
Bug #159: add dummy type to network interface type list.
Remove extra space before pppoe in interface types for nicer formatting.
Bug #170: add L2TPv3 to the interface type list.
0.20.43+vyos1+helium3
Add system option for ctrl-alt-del-action to configuration

This new configuration option allows the user to specify
what action to take on ctrl-alt-delete: disable, reboot
or poweroff. By default ctrl-alt-delete-action is set
to disable.

The ctrl-alt-delete action is configured in /etc/inittab.
Use elif conditional instead of if
Add syntax check to validate value
Bug #170: Rename nodes for consistency with the rest of the system.
Bug #170: Set default wait time to 0.
Bug #170: Set link up at after creating tunnel.
Bug #170: Add address, disable, and description options.
Bug #170: Break iproute2 commands in multiple line for better readability.
Bug #170: Specify interface name in iproute2 command to override default numering.
Bug #170: Remove "wait" option.
Bug #170: Improve help strings.
0.20.43+vyos1+helium4
Support and switch to overlayfs