Trivial: shorten the deploy/clean step failure message

It looks like this now:

Agent returned error for deploy step {'step': 'write_image', 'priority': 80,
'argsinfo': None, 'interface': 'deploy'} on node
878c3113-0035-5033-9f99-46520b89b56d : Error performing deploy_step
write_image: <next level error message>

Change-Id: Iabfb802cbfb96a9a02d6811f450f151623d5ca1f

ironic/drivers/modules/agent_base.py

@@ -1060,12 +1060,12 @@ class AgentDeployMixin(HeartbeatMixin, AgentOobStepsMixin):
             return
 
         if command.get('command_status') == 'FAILED':
-            msg = (_('Agent returned error for %(type)s step %(step)s on node '
-                     '%(node)s : %(err)s.') %
+            msg = (_('%(type)s step %(step)s failed on node %(node)s. '
+                     '%(err)s') %
                    {'node': node.uuid,
                     'err': agent_client.get_command_error(command),
-                    'step': current_step,
-                    'type': step_type})
+                    'step': conductor_steps.step_id(current_step),
+                    'type': step_type.capitalize()})
             return _step_failure_handler(task, msg, step_type)
         # NOTE(dtantsur): VERSION_MISMATCH is a new alias for
         # CLEAN_VERSION_MISMATCH, remove the old one after IPA removes it.

ironic/tests/unit/drivers/modules/test_agent_base.py

@@ -1703,6 +1703,10 @@ class AgentDeployMixinTest(AgentDeployMixinBaseTest):
         }]
         with task_manager.acquire(self.context, self.node['uuid'],
                                   shared=False) as task:
+            task.node.clean_step = {
+                'step': 'erase_devices',
+                'interface': 'deploy',
+            }
             self.deploy.continue_cleaning(task)
             error_mock.assert_called_once_with(task, mock.ANY, traceback=False)
             collect_logs_mock.assert_called_once_with(task.node,