Delete TRSNCEIVER tables while config reload (sonic-net#3680)

* Delete TRANSCEIVER tables while config reload

config/main.py

@@ -1322,6 +1322,18 @@ def flush_configdb(namespace=DEFAULT_NAMESPACE):
     return client, config_db
 
 
+def delete_transceiver_tables():
+    tables = ["TRANSCEIVER_INFO", "TRANSCEIVER_STATUS", "TRANSCEIVER_PM",
+              "TRANSCEIVER_FIRMWARE_INFO", "TRANSCEIVER_DOM_SENSOR", "TRANSCEIVER_DOM_THRESHOLD"]
+    state_db_del_pattern = "|*"
+
+    # delete TRANSCEIVER tables from State DB
+    state_db = SonicV2Connector(use_unix_socket_path=True)
+    state_db.connect(state_db.STATE_DB, False)
+    for table in tables:
+        state_db.delete_all_by_pattern(state_db.STATE_DB, table + state_db_del_pattern)
+
+
 def migrate_db_to_lastest(namespace=DEFAULT_NAMESPACE):
     # Migrate DB contents to latest version
     db_migrator = '/usr/local/bin/db_migrator.py'
@@ -1905,6 +1917,7 @@ def reload(db, filename, yes, load_sysinfo, no_service_restart, force, file_form
                 cfg_hwsku = output.strip()
 
             client, config_db = flush_configdb(namespace)
+            delete_transceiver_tables()
 
             if load_sysinfo:
                 if namespace is DEFAULT_NAMESPACE:
@@ -2037,6 +2050,7 @@ def load_minigraph(db, no_service_restart, traffic_shift_away, override_config,
     # Stop services before config push
     if not no_service_restart:
         log.log_notice("'load_minigraph' stopping services...")
+        delete_transceiver_tables()
         _stop_services()
 
     # For Single Asic platform the namespace list has the empty string