[VOL-2289] collect more logs during teardown

Change-Id: Idcb6a74786a9e2b41c5b5018d52ed925c88318ff
diff --git a/libraries/voltctl.robot b/libraries/voltctl.robot
index ba1313e..71da9a1 100644
--- a/libraries/voltctl.robot
+++ b/libraries/voltctl.robot
@@ -83,6 +83,12 @@
     Should Be Equal As Integers    ${rc1}    0
     Should Be Equal As Integers    ${rc2}    0
 
+Get Device List from Voltha
+    [Documentation]    Gets Device List Output from Voltha
+    ${rc1}    ${devices}=    Run and Return Rc and Output    ${VOLTCTL_CONFIG}; voltctl device list
+    Log    ${devices}
+    Should Be Equal As Integers    ${rc1}    0
+
 Validate Device
     [Arguments]    ${admin_state}  ${oper_status}  ${connect_status}  ${serial_number}=${EMPTY}  ${device_id}=${EMPTY}
     ...    ${onu_reason}=${EMPTY}   ${onu}=False