add link up cmd to fixture

DentOS_Framework/DentOsTestbed/src/dent_os_testbed/test/conftest.py

@@ -81,7 +81,7 @@ def pytest_collection_finish(session):
     global reboot_after_test
     for item in session.items:
         # Save the name of the last L1 test in session
-        if "test_l1" in item.name:
+        if 'test_l1' in item.name:
             reboot_after_test = session.items[-1]
             break
 
@@ -100,7 +100,7 @@ def pytest_runtest_setup(item):
     if reboot_after_test:
         if reboot_after_test.name == item.name:
             # Add `reboot_device` fixture to last L1 test
-            item.fixturenames.append("reboot_device")
+            item.fixturenames.append('reboot_device')
 
 
 def pytest_runtest_teardown(item, nextitem):
@@ -174,7 +174,9 @@ async def reboot_device(testbed):
     yield
     devices = await _get_dent_devs_from_testbed(testbed)
     to_reboot = [dev.reboot() for dev in devices]
+    up_ports = [dev.run_cmd('onlpd') for dev in devices]
     await asyncio.gather(*to_reboot)
+    await asyncio.gather(*up_ports)
 
 
 @pytest_asyncio.fixture()