Fix test_reload_config issue: #11654 (#11674)

1. Revert PR: #7289, because the relevant issue has been fixed by PR:sonic-net/sonic-buildimage#15080
2. Remove  wait_until(60, 1, 0, check_interfaces_config_service_status, duthost) in PR: #7953 due to the above same reason

tests/platform_tests/test_reload_config.py

@@ -7,7 +7,6 @@
 import logging
 
 import pytest
-import re
 
 from tests.common.fixtures.conn_graph_facts import conn_graph_facts # noqa F401
 from tests.common.utilities import wait_until
@@ -125,9 +124,6 @@ def test_reload_configuration_checks(duthosts, enum_rand_one_per_hwsku_hostname,
  # we must give it a little longer or else it may falsely fail the test.
  wait_until(360, 1, 0, check_database_status, duthost)
 
- # Check if interfaces-config.service is exited
- wait_until(60, 1, 0, check_interfaces_config_service_status, duthost)
-
  logging.info("Reload configuration check")
  out = duthost.shell("sudo config reload -y",
  executable="/bin/bash", module_ignore_errors=True)
@@ -145,8 +141,6 @@ def test_reload_configuration_checks(duthosts, enum_rand_one_per_hwsku_hostname,
  logging.info("Checking config reload after system is up")
  # Check if all database containers have started
  wait_until(60, 1, 0, check_database_status, duthost)
- # Check if interfaces-config.service is exited
- wait_until(60, 1, 0, check_interfaces_config_service_status, duthost)
  out = duthost.shell("sudo config reload -y",
  executable="/bin/bash", module_ignore_errors=True)
  assert "Retry later" in out['stdout']
@@ -170,11 +164,3 @@ def test_reload_configuration_checks(duthosts, enum_rand_one_per_hwsku_hostname,
  assert "Retry later" not in out['stdout']
 
  assert wait_until(300, 20, 0, config_system_checks_passed, duthost, delayed_services)
-
-
-def check_interfaces_config_service_status(duthost):
- # check interfaces-config.service status
- regx_interface_config_service_exit = r'.*Main PID: \d+ \(code=exited, status=0\/SUCCESS\).*'
- interface_config_server_status = duthost.command(
- 'systemctl status interfaces-config.service', module_ignore_errors=True)['stdout']
- return re.search(regx_interface_config_service_exit, interface_config_server_status)