Allow connection settings after CSV file loading

[mithro]

The analyzer CSV and CSR CSV files have useful information in it like;

• CSR data width
• Ethernet IP address
• Ethernet/Serial/PCIe connection endpoint
• etc

It seems like it is useful to be able to load these two files first, and then initialize the actual connection to the host.

Currently you do;

    wb = RemoteClient(args.ipaddress, 1234, csr_csv="{}/csr.csv".format(make_testdir(args)))
    wb.open()

Maybe it would be better to do something like;

    wb = RemoteClient(csr_csv="{}/csr.csv".format(make_testdir(args)))
    wb.open(args.ipaddress, 1234)

That way wb.open could get the default IP address/port details from the CSR file....

[enjoy-digital]

This is in fact related to LiteX and not LiteScope. The csr_csv parameter was here initially to provides the register and only that. I'll think about improving this in LiteX and if it's not overcomplicating things.