Currently, get_config_dict provides the sub-config at 'path', by passing the path argument to show_config. This results in
- the behaviour cited in T2662 through the interaction of the backend and configtree
- an additional dependency on, and call to, the vyatta backend
- ceding control of the result to the backend
As an alternative, it is suggested to add a utility function 'get_sub_dict', and apply that to the full config_dict obtained from show_config, for a non-empty path.