Cleanup redfish login and logout for session delete keyword

The required changes is already taken care at extended/standby_bmc.robot
where it is only used.

Change-Id: I9fba1ba89db84ac199a14d8d7ce32aa4bd8e9ba3
Tested: By running extended/standby_bmc.robot suite.
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/lib/bmc_redfish_utils.robot b/lib/bmc_redfish_utils.robot
index 5936574..6239d3f 100644
--- a/lib/bmc_redfish_utils.robot
+++ b/lib/bmc_redfish_utils.robot
@@ -63,7 +63,6 @@
 Delete All Redfish Sessions
     [Documentation]  Delete all active redfish sessions.
 
-    Redfish.Login
     ${saved_session_info}=  Get Redfish Session Info
 
     ${resp_list}=  Redfish_Utils.Get Member List
@@ -75,8 +74,6 @@
     :FOR  ${session}  IN  @{resp_list}
     \  Redfish.Delete  ${session}
 
-    Redfish.Logout
-
 
 Get Valid FRUs
     [Documentation]  Return a dictionary containing all of the valid FRU records for the given fru_type.