[SDFAB-635] Save Onos Diagnostics if a testcase fails

  - Add to Segment Routing utility module's cleanup
    function, so most tests don't need to explicitly
    call function

Change-Id: I47c8b7ae39350631037f61e5194afc1e5a40896f
diff --git a/TestON/tests/USECASE/SegmentRouting/UP4/UP4.params b/TestON/tests/USECASE/SegmentRouting/UP4/UP4.params
index 0779df9..0e5bdb9 100644
--- a/TestON/tests/USECASE/SegmentRouting/UP4/UP4.params
+++ b/TestON/tests/USECASE/SegmentRouting/UP4/UP4.params
@@ -14,6 +14,7 @@
         <appName>onos-classic</appName>
         <namespace>tost</namespace>
     </kubernetes>
+    <use_stern>True</use_stern>
 
     <UP4>
         <pdn_host>MgmtServer</pdn_host>