Fix ci_stage_3 logs creation for robot tests

Change-Id: Ic09adc5d5e71d250ea1bb84c84ae6ea0d35f0ed0
Signed-off-by: Felipe Vicens <felipe.vicens@atos.net>
diff --git a/jenkins/ci-pipelines/ci_stage_3.groovy b/jenkins/ci-pipelines/ci_stage_3.groovy
index b35e027..6c034e2 100644
--- a/jenkins/ci-pipelines/ci_stage_3.groovy
+++ b/jenkins/ci-pipelines/ci_stage_3.groovy
@@ -102,9 +102,7 @@
 }
 
 def archive_logs(stackName) {
-    sh """
-       docker service ls | grep ${stackname} | awk '{print $2}' | xargs -i% docker service logs "%" --timestamps > containers_logs.txt 2>&1
-       """
+    sh "docker service ls |grep \"${stackname}\"| awk '{print \$2}'| xargs -iy docker service logs y --timestamps > containers_logs.txt 2>&1"
     archiveArtifacts artifacts: 'containers_logs.txt'
 }