[VOL-3151] - Implement the keyword to restore ONUs to factory mode

- Remove the vlan inforamtion from the dp_inface_name when we reset the
  ONU
- Call the reset function in VOltha_PODTests (also DT workflow)

Change-Id: I3326d470760f7ff2f70e53b0f217895b8c61acc4
diff --git a/tests/dt-workflow/Voltha_DT_PODTests.robot b/tests/dt-workflow/Voltha_DT_PODTests.robot
index 3e06882..1d00580 100644
--- a/tests/dt-workflow/Voltha_DT_PODTests.robot
+++ b/tests/dt-workflow/Voltha_DT_PODTests.robot
@@ -252,6 +252,8 @@
 Setup Suite
     [Documentation]    Set up the test suite
     Common Test Suite Setup
+    #Restore all ONUs
+    Run Keyword If    ${has_dataplane}    RestoreONUs    ${num_onus}
 
 Clear All Devices Then Create New Device
     [Documentation]    Remove any devices from VOLTHA and ONOS