[Libvir] libver-python fix & test script

[Angus Thomas]

Against the current CVS version, the python method libvir.open() is 
failing because it requires "name" as a parameter, but in src/libvir.c, 
virConnectOpen returns NULL if name is set. Very simple patch attached.

Also attached is a simple script to test reporting of domain state via 
the python bindings. Hopefully useful as a test of the python 
bindings/simple example of how to use them. It generates output like this:

[root at chaka ~]# ./libver-python-test
Attached to a hypervisor of type - Xen
There are currently 2 domains running

Domain ID 0 is named Domain-0
        State is Running
        maxMem is -4
        memory is 262224
        nrVirtCpu is 1
        cpuTime is 2294771524162

Domain ID 2 is named guest1
        State is Blocked
        maxMem is 131072
        memory is 131052
        nrVirtCpu is 1
        cpuTime is 34682760385

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