[db_migrator] Migrate DNS configuratuion (sonic-net#2893)

ganglyu · rajkumar38 · commit 491e60a9a402 · 2023-07-25T18:43:44.000+05:30
What I did sonic-net/sonic-buildimage#14549 This PR has introduced DNS configuration to CONFIG_DB, we need to migrate original CONFIG_DB to support DNS configuration during upgrading SONiC. How I did it If there's no DNS_NAMESERVER table in CONFIG_DB, read DNS_NAMESERVER table from minigraph and update CONFIG_DB. How to verify it Run unit test for db migrator.
diff --git a/scripts/db_migrator.py b/scripts/db_migrator.py
@@ -1089,6 +1089,7 @@ def version_4_0_5(self):
         This is the latest version for master branch
         """
         log.log_info('Handling version_4_0_5')
+
         return None
 
     def get_version(self):
