Optional cell reselection parameters setting

Hi, I've just pushed a patch in sylvain/testing with vty commands (and support code) to support settings things such as the Cell Reselection Offset (which is in the re tst octet). If someone could just have a quick look before I put it in master. The main thing is the vty setting to support things like: penalty time <20-620> penalty time infinite I had to create two commands it seems (can specify that an arg is either a range or a keyword if I'm not mistaken). Cheers, Sylvain