[VOL-4041] Migration to single ONOS SSH connection

Change-Id: I91f5f3c96585097486bc862118d8753bf4b30cba
diff --git a/tests/scale/Voltha_Scale_Tests.robot b/tests/scale/Voltha_Scale_Tests.robot
old mode 100644
new mode 100755
index 902d367..a9fb66e
--- a/tests/scale/Voltha_Scale_Tests.robot
+++ b/tests/scale/Voltha_Scale_Tests.robot
@@ -283,7 +283,7 @@
 
 Teardown Suite
    [Documentation]    Close the SSH connection to ONOS
-    Close ONOS SSH Connection   ${onos_ssh_connection}
+    Close All ONOS SSH Connections
 
 Compute device IDs
     [Documentation]  Creates a list of ONOS device ID based on the test configuration