Extend TKLBAM functionality so it can patch OVZ templates and other VM images

I have started having a play with the code to extend it to OVZ but not really sure on the best way to go. I think continuing with the modular design makes the most sense, but I also thin that it would be most user friendly if the one script is called for all usage scenarios (ie image targets) and it works out what secondary scripts it need to call to do the job.