Copp Changes (#1004)

Added DB migrator script for removing old copp APP DB entries.

Co-authored-by: dgsudharsan <sudharsan_gopalarat@dell.com>

scripts/db_migrator.py

@@ -145,6 +145,19 @@ def migrate_intf_table(self):
             self.appDB.set(self.appDB.APPL_DB, table, 'NULL', 'NULL')
             if_db.append(if_name)
 
+    def migrate_copp_table(self):
+        '''
+        Delete the existing COPP table
+        '''
+        if self.appDB is None:
+            return
+
+        keys = self.appDB.keys(self.appDB.APPL_DB, "COPP_TABLE:*")
+        if keys is None:
+            return
+        for copp_key in keys:
+            self.appDB.delete(self.appDB.APPL_DB, copp_key)
+
     def version_unknown(self):
         """
         version_unknown tracks all SONiC versions that doesn't have a version
@@ -248,6 +261,8 @@ def common_migration_ops(self):
             for init_table_key, init_table_val in table_val.items():
                 self.configDB.set_entry(init_cfg_table, init_table_key, init_table_val)
 
+        self.migrate_copp_table()
+
     def migrate(self):
         version = self.get_version()
         log.log_info('Upgrading from version ' + version)