Fix the core-pva NetworkTest

[shroffk]

On Windows, the loopback interface display name may be reported as "Software Loopback Interface 1", which AddressInfo fails to parse even though the interface is valid.
Since the Network.parseAddress(...) is using the NetworkInterface.getByName(...) this does not always ( at least not on windows ) work with the display name.

For now we can just catch the exception and use lo.getName().

            try {
                addr = Network.parseAddress("[ff02::42:1]:5099@" + lo.getDisplayName(), PVASettings.EPICS_PVA_BROADCAST_PORT);
            } catch (Exception ex) {
                addr = Network.parseAddress("[ff02::42:1]:5099@" + lo.getName(), PVASettings.EPICS_PVA_BROADCAST_PORT);
            }

[kasemir]

Does getName() give constant results on all OS, so use that instead of getDisplayName?

[shroffk]

I think it is more consistent but not guaranteed constant.
I thought of keeping the first choice getdisplayName since it is more human readable and the very next line of the test is a print out.