Fixed VM unregister callback on hypervisor.

ccnode/hypervisor/__init__.py

@@ -225,10 +225,9 @@ class Hypervisor(object):
             vm = self.domains.pop(dom.name())
             # self.sjproxy.unregister(vm.name)
             self.async_calls[self.rpc_con.rpc.async_call_cb(
-                self.register_cb,
-                'register',
+                self.unregister_cb,
+                'unregister',
                 vm.name,
-                'vm',
             )] = vm.name
         elif event in ('Started', 'Suspended', 'Resumed', 'Stopped', 'Saved',
                        'Restored'):
@@ -251,11 +250,11 @@ class Hypervisor(object):
             self.main.reset_sub_tag(vm.name, tag)
 
     def unregister_cb(self, call_id, response=None, error=None):
-        vm = self.domains[self.async_calls.pop(call_id)]
+        vm_name = self.async_calls.pop(call_id)
         if error is not None:
             logger.error('Error while unregistering domain to server, %s', error)
-        logger.info('Delete domain: %s (%s)', vm.name, vm.uuid)
-        self.main.remove_sub_object(vm)
+        logger.info('Delete domain: %s', vm_name)
+        self.main.remove_sub_object(vm_name)
 
     def vm_define(self, xml_desc):
         """Create a VM on the Hypervisor