iotests: add filter_qmp_generated_node_ids()

Add a filter function for QMP responses that contain QEMU's
automatically generated node ids. The ids change between runs and must
be masked in the reference output.

The next commit will use this new function.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-ID: <20240118144823.1497953-2-stefanha@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

tests/qemu-iotests/iotests.py

@@ -651,6 +651,13 @@ def _filter(_key, value):
 def filter_generated_node_ids(msg):
     return re.sub("#block[0-9]+", "NODE_NAME", msg)
 
+def filter_qmp_generated_node_ids(qmsg):
+    def _filter(_key, value):
+        if is_str(value):
+            return filter_generated_node_ids(value)
+        return value
+    return filter_qmp(qmsg, _filter)
+
 def filter_img_info(output: str, filename: str,
                     drop_child_info: bool = True) -> str:
     lines = []