The old Vyatta::Config module module for Perl keeps everything inside an object.
We should do the same to the Python library for two reasons. First, it will enable more straightforward translation of the old code.
Second, the VyConf version in the future will implement full config session hangling, and this will be inherently stateful.
Even now there are some handy functions that require state keeping, such as set_level, so this will enable adding them back as well.