nwdiag : peer connections to the right and left

[jcralbino]

Is your feature request related to a problem? Please describe.
Performing nwdiag with peer connections today is only possible using in the horizontal approach ( up/down connections)

A
|
B

We propose to allow also connections from/to left and right of the device

A-B

Describe the solution you'd like

Describe alternatives you've considered

Additional context
Add any other context or screenshots about the feature request here.