Exiting the test if 'Validate Deleted Device Cleanup In ONOS' fails during 'Delete All Devices and Verify'

Change-Id: Ifce94d71faeffe2802225c6f6ed739a57f3959a4
diff --git a/libraries/utils.robot b/libraries/utils.robot
index 46c0880..470c811 100755
--- a/libraries/utils.robot
+++ b/libraries/utils.robot
@@ -701,7 +701,7 @@
     Wait Until Keyword Succeeds    ${timeout}    2s    Test Empty Device List
     FOR    ${I}    IN RANGE    0    ${num_olts}
         ${olt_serial_number}=    Set Variable    ${list_olts}[${I}][sn]
-        Run Keyword And Continue On Failure    Wait Until Keyword Succeeds    ${timeout}    5s
+        Wait Until Keyword Succeeds    ${timeout}    5s
         ...    Validate Deleted Device Cleanup In ONOS    ${ONOS_SSH_IP}    ${ONOS_SSH_PORT}    ${olt_serial_number}
     END
     # Clear devices from ONOS