[golden_config_infra] Backup and Restore config before test (#14421)

Description of PR
Summary: Default Config was changed during config_reload process. Need to backup and restore config.
Fixes # (issue) #14327

Type of change
 Bug fix
 Testbed and Framework(new/improvement)
 Test case(new/improvement)
Back port request
 202012
 202205
 202305
 202311
 202405
Approach
What is the motivation for this PR?
Fix config change issue. Remove t2 topo as it is not designed.

How did you do it?
Backup and restore

How did you verify/test it?
E2E test

co-authorized by: [email protected]

tests/golden_config_infra/test_config_reload_with_rendered_golden_config.py

@@ -18,6 +18,8 @@
 
 GOLDEN_CONFIG = "/etc/sonic/golden_config_db.json"
 GOLDEN_CONFIG_BACKUP = "/etc/sonic/golden_config_db.json_before_override"
+CONFIG_DB = "/etc/sonic/config_db.json"
+CONFIG_DB_BACKUP = "/etc/sonic/config_db.json_before_override"
 
 
 def file_exists_on_dut(duthost, filename):
@@ -40,6 +42,8 @@ def setup_env(duthosts, rand_one_dut_hostname, tbinfo):
     if topo_type in ["m0", "mx"]:
         original_pfcwd_value = update_pfcwd_default_state(duthost, "/etc/sonic/init_cfg.json", "disable")
 
+    # Backup configDB
+    backup_config(duthost, CONFIG_DB, CONFIG_DB_BACKUP)
     if file_exists_on_dut(duthost, GOLDEN_CONFIG):
         backup_config(duthost, GOLDEN_CONFIG, GOLDEN_CONFIG_BACKUP)
 
@@ -51,6 +55,8 @@ def setup_env(duthosts, rand_one_dut_hostname, tbinfo):
     if topo_type in ["m0", "mx"]:
         update_pfcwd_default_state(duthost, "/etc/sonic/init_cfg.json", original_pfcwd_value)
 
+    # Restore configDB after test.
+    restore_config(duthost, CONFIG_DB, CONFIG_DB_BACKUP)
     if file_exists_on_dut(duthost, GOLDEN_CONFIG_BACKUP):
         restore_config(duthost, GOLDEN_CONFIG, GOLDEN_CONFIG_BACKUP)
     else: