I wouldn't take cable cutters or any tools like that touring. I would just do as
TiHabanero does and coil it till I can get to a shop with good cable cutters and some end caps or maybe someone with a welder or some solder or something.
I generally would replace my cables and housing a month before a tour get everything settled in and adjusted and then probably not worry for a while. Unless you go through cables quickly it is not a huge worry. If you do go through cables a lot you should try and figure out why and solve that. Really what I carry for touring is tubes and some spare spokes and maybe a quick link and an emergency hanger but I don't go too crazy because I would end up carrying a spare everything and these days you can get pretty much anything anywhere either from a shop or via one of the many shippers in the world and the only time I might be really concerned is in the middle of nowhere in an underdeveloped country.