Add Redfish clearing logging entries

Changes needed to ensure if REST delete fails, redfish does the
cleaning of entries.

Change-Id: I44dfd71df5ed19b5a88432ace2e6561212d112d4
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/extended/standby_bmc.robot b/extended/standby_bmc.robot
index 0279680..6eeaff5 100644
--- a/extended/standby_bmc.robot
+++ b/extended/standby_bmc.robot
@@ -80,6 +80,7 @@
     #...  Cleanup Dir
 
     Run Keyword And Ignore Error  Delete All Error Logs
+    Run Keyword And Ignore Error  Redfish Purge Event Log
     Run Keyword And Ignore Error  Delete All Dumps
     Run Keyword And Ignore Error  Delete All Redfish Sessions
     Check For Current Boot Application Failures