[VOL-4599] Updated onu-upgrade at scale test to perform upgrade operations on all onus simultaneously

Change-Id: I486516c5c82bbb896b95d472f1c05fd8f3cb7796
diff --git a/libraries/voltctl.robot b/libraries/voltctl.robot
index 2a85e95..f8c4fb0 100755
--- a/libraries/voltctl.robot
+++ b/libraries/voltctl.robot
@@ -906,13 +906,13 @@
         ${dwlState}=    Get From Dictionary    ${imageState}    downloadState
         ${reason}=    Get From Dictionary    ${imageState}    reason
         ${imgStatus}=    Get From Dictionary    ${imageState}    imageState
-        Should Be Equal    '${version}'    '${image_version}'    Device ${dev_id}: '${version}' != '${image_version}'
+        Should Be Equal    '${version}'    '${image_version}'    Device ${deviceId}: '${version}' != '${image_version}'
         ...    values=False
-        Should Be Equal    '${dwlState}'    '${download_state}'    Device ${dev_id}: '${dwlState}' != '${download_state}'
+        Should Be Equal    '${dwlState}'    '${download_state}'    Device ${deviceId}: '${dwlState}' != '${download_state}'
         ...    values=False
-        Should Be Equal    '${reason}'    '${expected_reason}'    Device ${dev_id}: '${reason}' != '${expected_reason}'
+        Should Be Equal    '${reason}'    '${expected_reason}'    Device ${deviceId}: '${reason}' != '${expected_reason}'
         ...    values=False
-        Should Be Equal    '${imgStatus}'    '${image_status}'    Device ${dev_id}: '${imgStatus}' != '${image_status}'
+        Should Be Equal    '${imgStatus}'    '${image_status}'    Device ${deviceId}: '${imgStatus}' != '${image_status}'
         ...    values=False
     END