Make python objects inherit from 'object' base class

As of python >= 2.2, it is recommended that all objects inherit
from the 'object' base class. We already require python >= 2.3
for libvirt for thread macro support, so we should follow this
best practice.

See also

  http://stackoverflow.com/questions/4015417/python-class-inherits-objectSigned-off-by: NDaniel P. Berrange <berrange@redhat.com>

python/generator.py

@@ -1413,7 +1413,7 @@ def buildWrappers(module):
                 classes.write("        %s.__init__(self, _obj=_obj)\n\n" % (
                               classes_ancestor[classname]))
             else:
-                classes.write("class %s:\n" % (classname))
+                classes.write("class %s(object):\n" % (classname))
                 if classname in [ "virDomain", "virNetwork", "virInterface", "virStoragePool",
                                   "virStorageVol", "virNodeDevice", "virSecret","virStream",
                                   "virNWFilter" ]: