Fix LGTM

Change-Id: Iad3b9ff11c86f48e5cf8c7c5a182e0356586aab2

Author: Junchao-Mellanox

tests/common/fixtures/advanced_reboot.py

@@ -9,9 +9,6 @@
 import traceback
 
 from tests.common.mellanox_data import is_mellanox_device as isMellanoxDevice
-from tests.common.platform.interface_utils import check_interface_status_of_up_ports
-from tests.common.platform.processes_utils import check_critical_processes
-from tests.common.platform.processes_utils import wait_critical_processes
 from tests.common.platform.ssh_utils import prepare_testbed_ssh_keys as prepareTestbedSshKeys
 from tests.common.reboot import reboot as rebootDut
 from tests.common.helpers.sad_path import SadOperation

tests/platform_tests/test_advanced_reboot.py

@@ -5,7 +5,6 @@
 from tests.common.fixtures.ptfhost_utils import copy_ptftests_directory   # lgtm[py/unused-import]
 from tests.common.fixtures.ptfhost_utils import change_mac_addresses      # lgtm[py/unused-import]
 from tests.common.fixtures.duthost_utils import backup_and_restore_config_db
-from tests.common.reboot import reboot as rebootDut
 from tests.platform_tests.verify_dut_health import verify_dut_health      # lgtm[py/unused-import]
 from tests.platform_tests.verify_dut_health import add_fail_step_to_reboot # lgtm[py/unused-import]
 from tests.platform_tests.warmboot_sad_cases import get_sad_case_list, SAD_CASE_LIST