[VOL-4494] Added keyword Clean Up All Nodes to kill stale lxc processes in Suite Teardown

Change-Id: I44f0d1a070f9db8f8b8e88b0c4dafa141aabdd7c
diff --git a/tests/functional/Voltha_AlarmTests.robot b/tests/functional/Voltha_AlarmTests.robot
index e4ab03a..48520c9 100755
--- a/tests/functional/Voltha_AlarmTests.robot
+++ b/tests/functional/Voltha_AlarmTests.robot
@@ -380,6 +380,7 @@
     Run Keyword If    ${teardown_device}    Execute ONOS CLI Command use single connection    ${ONOS_SSH_IP}    ${ONOS_SSH_PORT}
     ...    device-remove ${of_id}
     Close All ONOS SSH Connections
+    Run Keyword If    ${has_dataplane}    Clean Up All Nodes
 
 # Onu Alarms