Using .log extension for the fils, easiness of opening with programs such as Console for Mac

Change-Id: Ifd4ae25fc2379ff9ec9d1d0e01fa20d43b3b8ce2
diff --git a/jjb/pipeline/voltha-scale-test.groovy b/jjb/pipeline/voltha-scale-test.groovy
index e2fbbe8..8a63363 100644
--- a/jjb/pipeline/voltha-scale-test.groovy
+++ b/jjb/pipeline/voltha-scale-test.groovy
@@ -367,7 +367,7 @@
         do
           echo "Getting logs for: ${app}"
           kubectl get pods -l app=${app} -o=jsonpath=\"{.items[*]['metadata.name']}\"
-          printf '%s\n' $(kubectl get pods -l app=$app -o=jsonpath="{.items[*]['metadata.name']}") | xargs -I@ bash -c "kubectl logs @ > $LOG_FOLDER/@.logs"
+          printf '%s\n' $(kubectl get pods -l app=$app -o=jsonpath="{.items[*]['metadata.name']}") | xargs -I@ bash -c "kubectl logs @ > $LOG_FOLDER/@.log"
         done
       '''
       // count how many ONUs have been activated