VOL-1495: Fix OMCI result logging

Positional parameters do not log the way expected.

Change-Id: I6c85d73b6b9bfe5708fc8a1d83b43beb63855d4a
diff --git a/python/adapters/brcm_openomci_onu/omci/brcm_mib_download_task.py b/python/adapters/brcm_openomci_onu/omci/brcm_mib_download_task.py
index 68d8d14..7116364 100644
--- a/python/adapters/brcm_openomci_onu/omci/brcm_mib_download_task.py
+++ b/python/adapters/brcm_openomci_onu/omci/brcm_mib_download_task.py
@@ -151,7 +151,7 @@
         failed_mask = omci_msg.get('failed_attributes_mask', 'n/a')
         unsupported_mask = omci_msg.get('unsupported_attributes_mask', 'n/a')
 
-        self.log.debug("OMCI Result: %s", operation,
+        self.log.debug("OMCI Result", operation=operation,
                        omci_msg=omci_msg, status=status,
                        error_mask=error_mask, failed_mask=failed_mask,
                        unsupported_mask=unsupported_mask)