[VOL-4041] Migration to single ONOS SSH connection

Change-Id: I91f5f3c96585097486bc862118d8753bf4b30cba
diff --git a/tests/tt-workflow/Voltha_TT_MultiTcontTests.robot b/tests/tt-workflow/Voltha_TT_MultiTcontTests.robot
index 69d8b2c..009bc65 100755
--- a/tests/tt-workflow/Voltha_TT_MultiTcontTests.robot
+++ b/tests/tt-workflow/Voltha_TT_MultiTcontTests.robot
@@ -228,3 +228,4 @@
     [Documentation]    Tear down steps for the suite
     Run Keyword If    ${has_dataplane}    Clean Up Linux
     Run Keyword If    ${teardown_device}    Delete All Devices And Verify
+    Close All ONOS SSH Connections