Merge "Set class ovsdb_conection to None" into stable/rocky

networking_ovn/ovsdb/impl_idl_ovn.py

@@ -57,6 +57,7 @@ class OvnNbTransaction(idl_trans.Transaction):
 # and therefor allows networking-ovn to manage connection scope on its own
 class Backend(ovs_idl.Backend):
     lookup_table = {}
+    ovsdb_connection = None
 
     def __init__(self, connection):
         self.ovsdb_connection = connection