Add missing parameter in python Disk IO error callback

The IO error callback was forgetting to pass the action
parameter, causing a stack trace when IO errors arrive

* python/libvirt-override-virConnect.py: Add missing action
  parameter in IO error callback

python/libvirt-override-virConnect.py

@@ -94,7 +94,7 @@
             cb = cbData["cb"]
             opaque = cbData["opaque"]
 
-            cb(self, virDomain(self, _obj=dom), srcPath, devAlias, opaque)
+            cb(self, virDomain(self, _obj=dom), srcPath, devAlias, action, opaque)
             return 0
         except AttributeError:
             pass