[VOL-2550] DT: Functional TC: Disable-Delete OLT

Change-Id: I31e2711ecc8e30eee971ab2c2245592a6ea8498f
diff --git a/libraries/voltctl.robot b/libraries/voltctl.robot
index 2d5fbf7..f35d171 100644
--- a/libraries/voltctl.robot
+++ b/libraries/voltctl.robot
@@ -51,11 +51,18 @@
 
 Disable Device
     [Arguments]    ${device_id}
-    [Documentation]    Enables a device in VOLTHA
+    [Documentation]    Disables a device in VOLTHA
     ${rc}    ${output}=    Run and Return Rc and Output
     ...    ${VOLTCTL_CONFIG}; voltctl device disable ${device_id}
     Should Be Equal As Integers    ${rc}    0
 
+Delete Device
+    [Arguments]    ${device_id}
+    [Documentation]    Deletes a device in VOLTHA
+    ${rc}    ${output}=    Run and Return Rc and Output
+    ...    ${VOLTCTL_CONFIG}; voltctl device delete ${device_id}
+    Should Be Equal As Integers    ${rc}    0
+
 Disable Devices In Voltha
     [Documentation]    Disables all the known devices in voltha
     [Arguments]    ${filter}