Change replace string character in xargs command from @ to % to not conflict
with @ symbol already in the path name

Change-Id: Ifcc43986409aa8a7a01131fccca4007be0ff16ce
diff --git a/jjb/pipeline/voltha-physical-soak-tests.groovy b/jjb/pipeline/voltha-physical-soak-tests.groovy
index e73bd3c..080efd1 100644
--- a/jjb/pipeline/voltha-physical-soak-tests.groovy
+++ b/jjb/pipeline/voltha-physical-soak-tests.groovy
@@ -203,7 +203,7 @@
 
       # collect ETCD cluster logs
       mkdir -p $WORKSPACE/etcd
-      printf '%s\n' $(kubectl get pods -l app=etcd -o=jsonpath="{.items[*]['metadata.name']}") | xargs -I@ bash -c "kubectl logs @ > $WORKSPACE/etcd/@.log"
+      printf '%s\n' $(kubectl get pods -l app=etcd -o=jsonpath="{.items[*]['metadata.name']}") | xargs -I% bash -c "kubectl logs % > $WORKSPACE/etcd/%.log"
       '''
       script {
         deployment_config.olts.each { olt ->