Fix log update-status error

This patch adds a dummy update_status function so that the update-status
hook 'has' a function to run and thus silence the log error.

Change-Id: I1f008b1cb0958e90967a6a4e95fb0fddb37795f4
Closes-bug: #1837639

hooks/neutron_ovs_hooks.py

@@ -233,6 +233,12 @@ def post_series_upgrade():
         resume_unit_helper, CONFIGS)
 
 
+@hooks.hook('update-status')
+def dummy_update_status():
+    """Dummy function to silence missing hook log entry"""
+    pass
+
+
 def main():
     try:
         hooks.execute(sys.argv)