Change data dir to include network name

[SWvheerden]

Change the data directory behavior to include the network name.
Currently, the folder structure looks as follows:

dir
     config
     data
     peer-db

This should be changed to be:

dir/{network_name}
                  config
                  data
                  peer-db

[hnidoaht-101]

Does anyone work on it yet? Otherwise, I'd like to resolve this.

[SWvheerden]

I think @brianp is.