Update pyvisa_py/protocols/rpc.py
Update pyvisa_py/protocols/rpc.py

Use 5000 milliseconds for the open_timeout if None was passed in.

Co-authored-by: Matthieu Dartiailh <25989b6867f1236c9ae631d07f3da08860839b24@laposte.net>
pyvisa/pyvisa-py