Fix recipient list in the notifyStatus message

Change-Id: I599eca2797c526c182d01a812590fef26496f8b9
diff --git a/jenkins/lib/vars/notifyStatus.groovy b/jenkins/lib/vars/notifyStatus.groovy
index 1c3f7a9..4d13af9 100644
--- a/jenkins/lib/vars/notifyStatus.groovy
+++ b/jenkins/lib/vars/notifyStatus.groovy
@@ -25,7 +25,7 @@
         node("deploy") {
           // Why do we even need a node to send a mail?
           // TODO(dmarting): maybe use mailext?
-          echo "Sending mail to ${recipients.join ','}"
+          echo "Sending mail to ${recipients}"
           step([$class: 'Mailer',
                 notifyEveryUnstableBuild: false,
                 recipients: recipients,