python: fix bindings that don't raise an exception
For example: >>> dom.memoryStats() libvir: QEMU Driver error : Requested operation is not valid:\ domain is not running There are six such python API functions like so. The root reason is that generator.py script checks the type of return value of a python stub function defined in libvirt-api.xml or libvirt-override-api.xml to see whether to add the raise clause or not in python wrapper code in libvirt.py. The type of return value is supposed to be C types. For those stub functions which return python non-integer data type like string, list, tuple, dictionary, the existing type in functions varies from each other which leads problem like this. Currently, in generator.py, it maintains a buggy whitelist for stub functions returning a list type. I think it is easy to forget adding new function name in the whitelist. This patch makes the value of type consistent with C type "char *" in libvirt-override-api.xml. For python, any of types could be printed as string, so I choose "char *" in this case. And the comment in xml could explain it when adding new function definition. <function name='virNodeGetCPUStats' file='python'> ... - <return type='virNodeCPUStats' info='...'/> + <return type='char *' info='...'/> ... </function>
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