Supress private key output in jenkins console

Change-Id: I0fa3f48388da50daac16dc4532952cbcde48719a
diff --git a/src/com/mirantis/mk/ssl.groovy b/src/com/mirantis/mk/ssl.groovy
index 7619ff5..24ccd52 100644
--- a/src/com/mirantis/mk/ssl.groovy
+++ b/src/com/mirantis/mk/ssl.groovy
@@ -37,7 +37,7 @@
     c = common.getSshCredentials(credentialsId)
     sh("test -d ~/.ssh || mkdir -m 700 ~/.ssh")
     sh('pgrep -l -u $USER -f | grep -e ssh-agent\$ >/dev/null || ssh-agent|grep -v "Agent pid" > ~/.ssh/ssh-agent.sh')
-    sh("echo '${c.getPrivateKey()}' > ~/.ssh/id_rsa_${credentialsId} && chmod 600 ~/.ssh/id_rsa_${credentialsId}")
+    sh("set +x; echo '${c.getPrivateKey()}' > ~/.ssh/id_rsa_${credentialsId} && chmod 600 ~/.ssh/id_rsa_${credentialsId}; set -x")
     runSshAgentCommand("ssh-add ~/.ssh/id_rsa_${credentialsId}")
 }