Checkpoint IXP support so I can install it: Added subnodelist command
to return the name/type of subnodes. Added a subconfig command that returns a type-specific configuration that the client will know what to do with. At the moment, just ixp is known as a subnode. The subnode support mostly works off the vnode stuff since otherwise it would be lot of code duplication. Eventually subnode should replace vnode, and vnode will become a type of subnode (like ixp). Also changed usage of control_net to control_iface, and made use of the "role" slot in ifconfig to determine what interfaces to return info for.