[Jenkins] Fix error in do_update function

Fix error with sshpass wich block starting of update process
on production environment.

Change-Id: I7b383d55de344f4c2507994c77ee284514bbcb6d

diff --git a/jenkins/build_cluster/build_cluster.py b/jenkins/build_cluster/build_cluster.py
index 089e651b7ecd57e056de219cc78938efd141ad1c..3a3ba39ddc2550d3cb7f527e12326ca47c7c8e34 100755 (executable)
--- a/jenkins/build_cluster/build_cluster.py
+++ b/jenkins/build_cluster/build_cluster.py
@@ -482,7 +482,13 @@ def do_update(conn_line,psw):
     if copy_update_helper(conn_line,psw):
         return sshpass_admin_node(
             psw=psw,
-            ssh_cmd=["ssh",conn_line,"/tmp/"+UPDATE_HELPER,],)
+            ssh_cmd=["ssh",
+                    "-o",
+                    "UserKnownHostsFile=/dev/null",
+                    "-o",
+                    "StrictHostKeyChecking=no",
+                    conn_line,
+                    "/tmp/"+UPDATE_HELPER,],)
     else:
         print ("ERROR: Unable to copy update script to admin node")
         return False