Ignore session delete failure

When deleting all the active session, it is possible that a listed
session just expired and cleanup automatically. In that situation
the delete would return failure.

Change-Id: I17e4fc20eec1cecd605b9367b9d88b15f538f382
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/lib/bmc_redfish_utils.robot b/lib/bmc_redfish_utils.robot
index 13055d4..fedbe3d 100644
--- a/lib/bmc_redfish_utils.robot
+++ b/lib/bmc_redfish_utils.robot
@@ -119,7 +119,7 @@
     Remove Values From List  ${resp_list}  ${saved_session_info["location"]}
 
     FOR  ${session}  IN  @{resp_list}
-        Redfish.Delete  ${session}
+        Run Keyword And Ignore Error  Redfish.Delete  ${session}
     END