GUI: Changes for Expired_Certificate Install and Replace.

Changes :-
    As per new changes Expired certificate able to allow and gives success message,for that made code chnages for below testcases.

    - Verify_Expired_Certificate_Install
    - Verify_Expired_Certificate_Replace

Tested :-
    -  Successfully ran this from redfish/managers/test_certificate.robot

Change-Id: I541205d01009eb694edffce6a68e8c832dbd4dab
Signed-off-by: rramyasr-in <rramyasr@in.ibm.com>
diff --git a/redfish/managers/test_certificate.robot b/redfish/managers/test_certificate.robot
index e9f7fd8..71f8ac5 100644
--- a/redfish/managers/test_certificate.robot
+++ b/redfish/managers/test_certificate.robot
@@ -188,8 +188,8 @@
     [Teardown]  Run Keywords  FFDC On Test Case Fail  AND  Restore BMC Date
 
     # cert_type  cert_format          expected_status
-    Client       Expired Certificate  error
-    CA           Expired Certificate  error
+    Client       Expired Certificate  ok
+    CA           Expired Certificate  ok
 
 
 Verify Expired Certificate Replace
@@ -200,7 +200,7 @@
     [Teardown]  Run Keywords  FFDC On Test Case Fail  AND  Restore BMC Date
 
     # cert_type  cert_format          expected_status
-    Server       Expired Certificate  error
+    Server       Expired Certificate  ok
 
 
 Verify Not Yet Valid Certificate Install