clean up lg_sv

[minshallj]

Currently we check the panoid to see if we should use "old_streetview" or "streetview" https://github.com/EndPointCorp/lg_ros_nodes/blob/master/lg_sv/src/lg_sv/server.py#L304-L309

We want to be able to have a rosparam toggle this behavior on/off and assign a default streetview type to use. Likely we want to be able to provide a function to the server that can be used to filter a panoid to check if we are using the right type. So in our current set up we'd be passing in a different function for lg_sv and lg_sv_nonfree, one which would just return "streetview_old" when the panoid is < 64 characters (or whatever it does in the code) and another that returns "streetview" when it's >= 64 characters

[FuriousJulius]

#395