Fix backup node lookup

The node lookup code added in change
I27201319f31cdc01605a3c5ae9ef4b4218e4a3f6
was slightly broken in that we call a method
with a keyword arguemnt which doesn't exist.

uuid versus node_uuid.

It happens, it is a quick fix!

Spotted on a metalsmith job:

[-] Agent is requesting to perform an explicit node cache update.
    This is to pickup any chanages in the cache before deployment.
[-] Failed to update node cache. Error lookup_node() got an
    unexpected keyword argument 'uuid'

Change-Id: I59ecec65707a2f03918b233f1925395ebe59b8c4

ironic_python_agent/hardware.py

@@ -498,7 +498,7 @@ def update_cached_node():
                 hardware_info=list_hardware_info(use_cache=True),
                 timeout=API_LOOKUP_TIMEOUT,
                 starting_interval=API_LOOKUP_INTERVAL,
-                uuid=uuid)
+                node_uuid=uuid)
             cache_node(content['node'])
             return content['node']
         except Exception as exc:

ironic_python_agent/tests/unit/test_hardware.py

@@ -4533,7 +4533,7 @@ class TestAPIClientSaveAndUse(base.IronicAgentTest):
             hardware_info=mock.ANY,
             timeout=1,
             starting_interval=2,
-            uuid='node1')
+            node_uuid='node1')
         self.assertEqual(updated_node, hardware.NODE)
         calls = [mock.call('list_hardware_info'),
                  mock.call('wait_for_disks')]

releasenotes/notes/fix-auxillarly-node-lookup-argument-83d3f717c039e454.yaml

@@ -0,0 +1,9 @@
+---
+fixes:
+  - |
+    Fixes a minor incorrect keyword argument that was
+    matching between the method caller and the unit test but
+    not the actual method, unit test, and caller. This was
+    a non-fatal issue, and should now permit the agent to
+    attempt to lookup the node one last time before deploying
+    the instance image to pick-up a root device hint.