Cant be used with parallel nixnet access

### Describe the bug
We got a PXI recording via xnet using a trigger and logger.

If we try to open a port in a parallel xnet Session it doesnt work, because the interface only creates a session, but it needs to use the function connect_terminals, to be able to work in parallel mode

### To Reproduce
Open the nixnet Port on a System, try to open it from somewhere Else in parallel

### Expected behavior
Parallel access is possible

### Additional context
python-can version: 4.0