Automation fix to ignore the errors of delete redfish session

Change-Id: I3f2ac85fcd37cc8ad1936933e8e1e763db04382b
Signed-off-by: Sushil Singh <susilsi7@in.ibm.com>
diff --git a/redfish/service_root/test_service_root_security.robot b/redfish/service_root/test_service_root_security.robot
index 59adfa3..35e24b2 100644
--- a/redfish/service_root/test_service_root_security.robot
+++ b/redfish/service_root/test_service_root_security.robot
@@ -68,7 +68,7 @@
 Create Multiple Login Sessions And Verify
     [Documentation]  Create 50 login instances and verify.
     [Tags]  Create_Multiple_Login_Sessions_And_Verify
-    [Teardown]  Multiple Session Cleanup
+    [Teardown]  Run Keyword And Ignore Error  Multiple Session Cleanup
 
     Redfish.Login
     # Example: